Airline-Approved Cat Carriers: Under-Seat Sizes & Top Picks (2025)

Last updated: 30 November 2025

Flying with a cat in cabin isn’t just about “pet allowed/not allowed.” Once you start looking closely, you realise airlines have their own idea of what “under-seat” means, carrier measurements don’t always match reality, and your cat’s body shape matters just as much as the label on the bag.

This guide takes you through:

• Knowing whether your route even allows cats in cabin;
• Understanding under-seat size limits;
• Choosing a carrier that actually works for your cat and your flight;

To get there, we start with your travel path, then walk down to most likely airline, so you always know what’s realistically possible before you book.

For a detailed, airline specific guide, go here: Airlines That Allow Cats in Cabin 2025 — Updated Guide.

Before we go deeper into measurements and airline tables however, here’s a simple shortcut to help you quickly get your bearings.

🏆 Our Top 3 Airline-Approved Carriers at a Glance (2025)

Most travellers land on one of these three. Each solves a different kind of journey, and all of them are cabin-safe on a wide range of airlines.

If your cat is taller, longer-bodied, or over ~6–6.5 kg, skip these quick picks and read the “Bigger / taller cats (the on-the-line scenario)” section first — for some cats, a standard cabin carrier is simply too tight and a well-set-up IATA crate in cargo is the kinder option.

Best all-rounder
Short & mid-haul, flexible routes
Mr. Peanut’s Gold Series Expandable
Soft-sided with a tapered shape and a stable base. It cheats the under-seat space visually on many EU/US airlines while still giving most average-sized cats enough room to shift and settle.

Best for strict rules & long-haul
Overnight flights & tighter dimensions
Sleepypod Air
Built for long-haul cabin travel: low profile, very structured, and genuinely comfortable. It behaves like a small “moving bedroom”, which helps when you’re dealing with stricter carriers and 10+ hour journeys.

Best for short hops & budget-friendly
1–4 hour flights
Sherpa Original Deluxe (Medium)
A light, proven option for regional flights. Soft-sided, easy to carry, and designed to slide under the seat on many mainstream airlines when you stay within their published size limits..

Note: Always double-check the carrier’s external dimensions against your airline’s current pet policy before you travel, and keep an eye on aircraft changes. This section is a starting point, not a guarantee.

1. Before The Airlines: Measuring Your Cat & Carrier

Before anything, it helps to get a clear sense of two things: your cat’s true size, and the real-world size of any carrier you’re considering.

Most people reading this haven’t bought a new carrier yet, so this section is for both situations - choosing a new carrier, or checking one you already have.

1.1 If you’re shopping online: how to read carrier dimensions properly

Product listings often show measurements that come from the fabric panels, not the final, built shape. A carrier advertised size might measure a few centimetres more once the seams, frame, padding, and zips are all in place.

So when evaluating online options:

• Treat listed dimensions as approximate, not precise.
• Expect the real external size to be 1–3 cm larger in each dimension.
• Look closely at photos showing the carrier under a seat — these are often aspirational, not strictly literal.
• Prioritise brands that publish external measurements, not “interior space.”

And remember: it is normal to buy → measure → return if it doesn’t match the airline limits. Pet-carrier buyers do this all the time, and reputable brands expect it.

1.2 If you already own a carrier: measure the external footprint

If you have the carrier in front of you, measure the full length, width and height.

This is the size the airline will consider, not the manufacturer’s label.

Soft carriers flex a little, but only a little. Treat the airline limit as the available space, not the “wiggle room”.

1.3 Measure your cat’s body, not just their weight

Don’t forget that your cat must feel comfortable in the carrier, this means ensuring that length and height fit their mould:

• Loafed position - does your cat have a bit of headroom?
• On the side - Can they stretch more than just a bit to get comfortable?

Try and blend these criteria with the length of the flight, and you should be in a good stead to make the journey a good one for your cat.

1.4 Why soft-sided usually helps, and doesn’t solve

Soft carriers are usually the best bet for cabin travel because they:

• Flex a couple of centimetres under the seat.
• Handle seat-rail curves better.
• Let the cat shift more comfortably.

But they won’t make an oversized carrier magically acceptable. If you’re 4–6 cm over the limit, soft sides won’t save you.

1.5 A mindful check

If your cat is tall, long, or close to the airline’s weight limit, cabin travel can become tight. In those cases, the kinder option may be:

• A larger IATA crate (cargo on a pet-friendly carrier).
• A ferry/train alternative (for EU routes).
• A different airline with more generous dimensions.

Unfortunately, it’s a tricky decision to make, but when evaluating options it makes sense to choose the path where your cat can relax, breathe, and settle.

2. Route-First Entry: Choose Your Path

Before you look at airline rules, it helps to consider the journey you’re taking.

Most travellers think in routes, not aircraft types or under-seat diagrams. So this section gives you a simple starting point: pick the corridor you’re flying, then use the airline table below to drill into the exact rules.

This is to help you orient before scrolling into specifics.

UK ↔ EU

Common airlines that allow cats in cabin:
KLM, Air France, Iberia, Vueling, Finnair, Lufthansa, SWISS, Austrian, TAP, SAS.

What to expect:
Typically aircrafts with under-seat spaces in the 40–45 cm length range. Perfectly workable for most soft-sided carriers, but you’ll still want to check your airline row for exact limits.

UK ↔ US / Canada

Common carriers with cabin pets:
Delta, United, American Airlines, Air Canada, JetBlue, WestJet.

What to expect:
These are long-haul flights, but many UK-origin long-hauls do not allow pets in cabin (BA, Virgin, etc.), so your airline choice matters a lot. Use the table to confirm whether your specific flight permits cabin pets at all.

US ↔ EU

Common cabin-friendly airlines:
KLM, Air France, Lufthansa, Iberia, Finnair, SAS.

What to expect:
Cabin pets are often allowed from the US into Europe, but not always in the reverse direction depending on route or quarantine rules. Under-seat space is usually generous on long-haul aircraft, but rules vary by airline rather than aircraft.

Intra-EU

Common airlines:
KLM, Air France, Lufthansa Group, Iberia/Vueling, Finnair, SAS, TAP.

What to expect:
Typically short to mid-haul flights with varying under-seat space, but most airlines tend to stick to similar size allowances.

Intra-US / Canada

Common airlines:
Delta, United, American Airlines, JetBlue, Alaska, Air Canada, WestJet.

What to expect:
Almost all cabin-pet-friendly US/CA airlines. Space and checks vary most by seat row, with window seats sometimes having slightly less height.

Long-Haul: UK/EU/US ↔ Asia / Middle East / Oceania

Common carriers that sometimes allow pets in cabin:
Turkish Airlines, Qatar Airways, ANA, Lufthansa (specific routes), SWISS (selected).

What to expect:
This corridor has the widest variation in pet rules. You should always confirm your specific flight number in the table below - long-haul is where the most “exceptions to the exceptions” live.

When you’ve found your corridor:
Move down to the airline table and check your row. That’s where you’ll see:

• The exact carrier size limit.
• The weight rule (if any).
• The type of carrier allowed.
• Cabin/route quirks.
• The official policy link.

Once you’ve done that, the scenario-based recommendations will help you choose (or keep) the right carrier confidently.

3. Airline Table: Under-Seat Sizes & Pet Rules (2025 Snapshot)

The table below pulls together what matters most for in-cabin cats.

Remember: it’s a snapshot, not set-in-stone rules. Treat this as your starting point, then click through to the official policy before you book.

Dimensions are shown exactly as airlines publish them. Where only one size is shown, it’s the maximum carrier size for cabin pets, not a generic carry-on.

*“Cabin cats allowed?” here means non-assistance cats as standard cabin pets, not only service animals.

You don’t need to memorise any of this. The practical question is:

• Am I clearly inside these limits? (Green)
• Barely brushing up against them with a soft bag? (Amber)
• Or clearly outside them with a tall carrier or tall cat? (Red)

We’ll use that Green/Amber/Red framing in the next section.

4. About Policy vs Cabin Reality

By now you’ve seen the numbers, but they don’t tell the whole story.

Aircrafts aren’t built around tidy measurements, so instead of thinking, “Do I meet the rule?”, it helps to think, “How will this actually feel for my cat?”

Let’s walk through it together.

4.1 Under-seat space varies

Airlines publish one neat dimension, but the cabin may offer a slightly different reality.

Inside the aircraft, three things change the space:

• Window seats curve inward → slightly lower height.
• Aisle seats may have metal brackets → tighter width.
• Middle seats are often the most forgiving.

So if your carrier sits right at the limit, choosing a middle seat it could be the winning option.

4.2 Soft-sided carriers can help, within reason

Soft carriers are popular because they shape themselves to the space. But let’s be careful with the “overflow”:

• 0–1 cm over → often fits naturally without stress.
• 2–3 cm over → sometimes fine, but expect a human decision at check-in.
• 4+ cm over → treat as a warning, the cabin may simply be too tight.

As always, this is about giving your cat a comfortable space to settle into for the hours ahead.

4.3 Green / Amber / Red: a simple way to read your situation

To understand where you stand and how much margin you have, consider using this model:

• Green: “This should work.”
  Your carrier is fully within the limits. Most travellers here walk through check-in calmly and fly without issues.
• Amber: “It probably works, but give yourself some breathing room.”
  Your carrier is close to the line, but soft-sided. You might be fine, but choose your seat carefully.
• Red: “Pause and rethink.”
  This could mean the carrier is too tall, the cat is naturally long or upright, or the airline’s limits are extremely tight. It’s not a failure — it’s simply the system telling you to choose the option that’s genuinely kinder for your cat.

Sometimes the right choice is to pick a different airline, or a properly sized IATA crate that lets them stand comfortably.

5. Short, Mid, Long-Haul & Bigger Cats

Once you understand your airline’s limits, the next step is choosing the right carrier.

Instead of asking, “What’s the best carrier?”, try asking:

“What carrier best matches type of flight ahead of us?”

Let’s walk through the four scenarios most travellers fall into.

5.1 Short-Haul (up to ~3–4 hours)

✈️ The Short-Haul Winner

For flights under 4 hours, don't overthink it. The Sherpa Original Deluxe is the standard for a reason: it's flexible, and it fits almost anywhere.

Check Price on Amazon →

Why this works
Short flights are about smooth transitions. Your cat spends more time in the airport than in the air, so a carrier that moves lightly and fits neatly under the seat reduces the emotional load on both of you.

Cat types this suits

• Slender cats up to ~4 kg
• Confident travellers
• Cats who settle once enclosed

If your cat is nervous, a softly structured short-haul carrier allows a towel or small blanket to make it feel more like a nook than a bag.

5.2 Mid-Haul (5–9 hours)🌟 The Mid-Haul "Den"

If you have a 6+ hour flight or a layover, the Mr. Peanut's Gold Series is your best bet. The expandable side gives your cat a "patio" to stretch out in during the quiet moments at the gate.

Check Price on Amazon →

Why this works
Mid-haul flights are long enough for your cat to cycle through alert → settled → dozing. A tapered soft-sided design gives them room to shift while still fitting the strict EU/US airline limits.

Cat types this suits

• Compact but stockier builds
• Cats who like to curl into a doughnut
• Cats who need airflow but dislike open visibility

Think of this carrier pattern as a “flexible cocoon”: stable enough for the hours ahead, forgiving enough to adapt to whatever under-seat shape you get.

5.3 Long-Haul & Overnight (10+ hours)

🛡️ The Long-Haul Fortress

For overnight flights or strict 8kg limits, the Sleepypod Air is an investment in peace of mind. Its low profile cheats the visual height test, and the structure protects your cat for 12+ hours.

Check Price on Amazon →

Why this works
On long-hauls, comfort becomes a cycle: rest → stretch → resettle → rest again. A bag with a firmer shape gives your cat predictable flooring and reduces the sensation of being pushed by the seat in front.

It also protects them during those periods when turbulence or cabin activity create background noise.

Cat types this suits

• Cats who like defined boundaries
• Anxious travellers who need a “safe den”
• Older cats who do better with firm support

You’re essentially creating a small, reliable bedroom that happens to move with the plane.

Planning an airport overnight?
If your route includes a layover near the airport, check our cat-friendly hotel guides for Heathrow (LHR) and JFK before you book. We’ve already verified the pet fees and flagged the quieter options.

5.4 Bigger / Taller Cats (the “on-the-line” scenario)

For cats who are technically within cabin limits but built like small panthers, the EliteField Pet Soft Carrier gives them the extra space they need. Its wider base lets a long-bodied cat actually lie down, not just pretend to.

Check Price on Amazon →

Why this works Bigger cats need usable space. A wider and more forgiving floor pan lets them do the essential cycle: curl → extend → breathe → settle.

The structure stays soft enough to comply with airline under-seat requirements, but firm enough that your cat doesn’t feel compressed by the cabin geometry.

Cat types this suits

• Long, tall, or “on-the-line” cats

You’re essentially giving them a compact studio apartment instead of a tight hallway.

5.5 When NOT to buy a new carrier at all

Sometimes the best choice isn’t buying anything. If:

• Your current carrier is soft-sided,
• It meets your airline’s limits,
• Your cat is already comfortable in it,

…then the smartest, kindest move is to keep it and spend your energy on acclimating the cat, rather than upgrading the bag.

A familiar space beats a “perfect” new one, especially in the middle of an airport.

6. Seat Selection (Making the Under-Seat Space Work for You)

As a general rule of thumb, it’s best to avoid bulkhead and exit rows entirely. Pick a standard seat where under-seat storage is guaranteed (usually marked on the seat map). In doubt, use this simple rule that works across almost every aircraft:

• If your carrier is fully within the airline’s limits → you have flexibility.
• If your carrier is close to the limits → choose a middle seat whenever possible.
• If your cat is tall or long-bodied → centre-section seats on wide-bodies are your friend.

In doubt, typically the middle seat is the safe choice. Small detail, big difference. Especially on long travel days.

7. In-Depth Review: Top Airline-Approved Cat Carriers (2025)

By now you know which kind of journey you’re planning and roughly what shape of carrier you need. This section pulls everything together into a set of choices that actually work with real airline limits and real cats.

7.1 Sherpa Original Deluxe (Medium). Best for Short-Haul & Simple Setups

Best for: 1–4 hour flights on common EU/US routes where you want something light, familiar, and easy to handle on a busy travel day.

The Sherpa Original Deluxe in medium is the classic “first airline carrier”. It’s soft-sided with a flexible frame, plenty of mesh, and a footprint that behaves nicely under most seats. It doesn’t pretend to be a luxury den but it’s a straightforward, no-drama way to get your cat from A to B in cabin.

Pros

• Soft-sided with a slightly springy top that tucks under many under-seat spaces without scraping.
• Lightweight and easy to carry through terminals, shuttles and security lines.
• Mesh on multiple sides so you can check on your cat without fully unzipping.
• Recognisable “airline-style” silhouette that staff are used to seeing.
• Usually more budget-friendly than premium long-haul carriers.

Cons

• Less structure and padding than higher-end bags — perfectly fine for short hops, not designed for 12-hour days.
• Taller or very long-bodied cats may feel snug, especially if your airline’s height limit is tight.
• Because it’s soft and light, the base can sag a little if heavily loaded.

Verdict for cat travel

If most of your flights are regional or under four hours, and your cat is roughly “average” in size, this is the easiest option to live with. It reduces friction at every point — check-in, boarding, under-seat — without asking you to overthink anything.

Check Sherpa Original Deluxe (Medium) On Amazon →

7.2 Mr. Peanut’s Gold Series Expandable. Best All-Rounder

Best for: 5–9 hour flights, mixed itineraries, and travellers who want more comfort than a basic bag but still need something that respects airline limits.

Mr. Peanut’s Gold Series Expandable steps things up a notch. Zipped up, it’s a neat soft-sided carrier with a tapered top that fits under many EU/US seats. Unzipped, the expandable section gives your cat extra space to stretch at the gate, during layovers, or in the hotel room after a long day.

Pros

• Expandable panel adds meaningful extra space when you’re not restricted by under-seat rules.
• Tapered shape (wider base, softer top) helps with awkward seat rails and boxes.
• More structured base than ultra-budget carriers, so your cat doesn’t feel the floor bowing underneath.
• Multiple openings make it easier to check on, feed, or soothe your cat without fully opening the bag.
• Feels like a solid “do-most-things” choice without jumping straight to premium pricing.

Cons

• Bulkier and a little heavier than the most minimal soft carriers.
• You need to keep the expansion zipped during take-off/landing and whenever space is tight — expansion is for downtime, not the whole flight.
• Small variations between models/sellers mean it’s worth double-checking listed dimensions before you buy.

Verdict for cat travel

If you fly occasionally but not just once in a decade, this is a very good “one carrier to do most trips” option. It gives your cat a more stable, den-like space on mid-haul flights, with the flexibility to open things up as soon as rules and space allow.

Check Price On Amazon →

7.3 Sleepypod Air. Best for Long-Haul, Stricter Rules & Sensitive Cats

Best for: 10+ hour or overnight flights, stricter long-haul airlines, and cats who need the calmest, most stable setup you can realistically carry in cabin.

Sleepypod Air is built from the ground up as a serious travel carrier. It keeps a low profile to respect tighter height limits, but inside it feels more like a small, padded room than a floppy bag. The structure keeps the floor flat and predictable, and the quality of the padding stands up to genuinely long days in transit.

Pros

• Low overall height tailored to stricter airline rules, without turning the interior into a tight box.
• Structured sides and base that prevent sagging and weird pressure points over long flights.
• High-quality padding and covers that can be removed and cleaned between trips.
• Mesh panels you can partially cover to create darkness when your cat is ready to switch off.
• Designed specifically for cabin travel, including gentle under-seat compression.

Cons

• Noticeably more expensive than basic or mid-range carriers.
• Heavier to carry around terminals than ultra-light bags.
• May be “overkill” if you only ever do short regional hops once every few years.

Verdict for cat travel

If your reality is red-eyes, multi-leg itineraries, or emotionally high-stakes relocations, this is the carrier that often feels worth the investment. It’s particularly kind to anxious, older, or physically sensitive cats who benefit from a stable, well-padded environment they can trust.

Check Price On Amazon →

7.4 Best Carrier for Longer, Taller or “Borderline” Cats

Best for: Long-bodied or taller cats who technically fit within your airline’s limits, but feel cramped in ultra-compact carriers.

Some cats simply take up more honest space — long spines, tall sitting posture, broader shoulders. The Love Thy Beast nylon-style carrier is designed with a bit more internal room and a supportive base, while still being soft-sided enough to adapt to under-seat curves. It gives bigger cats a chance to curl deeply instead of being forced upright against a hard roof.

Pros

• More generous internal volume than many “tiny footprint” carriers.
• Soft sides with a supportive base, so large cats can settle into a natural curl.
• Good ventilation and visibility options, which can help taller cats feel less wedged in.
• Works well alongside careful airline choice and seat selection for borderline cabin cases.

Cons

• Not a magic solution for very strict airlines — if the published limits are extremely tight, even this may be too large.
• Can feel big to carry if you’re used to ultra-compact carriers.
• Availability and pricing can be more variable than standard big-box brands.

Verdict for cat travel

If your cat is clearly on the bigger or taller side and every standard carrier you’ve tried feels mean, this is one of the kinder ways to make cabin travel workable. Combined with realistic airline choice and a middle seat or centre-block seat, it can take a lot of pressure off both of you.

Check Price On Amazon →

7.5 When a New Carrier Isn’t the Answer

It’s worth saying this out loud: you don’t have to buy something new if you already have a carrier that ticks the right boxes.

If your current soft-sided carrier:

• meets your airline’s size limits,
• is in good condition, and
• feels familiar and safe to your cat,

…then keeping it and focusing on gentle acclimation is often the kindest move. For most cats, known smells and a familiar routine do more for their stress levels than an extra centimetre of padding ever will.

8. Final Booking Sequence: What to Do, in What Order

Follow the flow of this article and you should be in a very good position to master air travelling with your cat.

Let’s recap:

• Pick your path.
• Use the table to check the relevant airlines.
• Identify the carrier size.
• Consult the scenarios in Section 5 for travel comfort.
• Buy the carrier or use what you have.

8.1 When ready, book your ticket

Book a seat map that shows middle seats or centre-block seats on widebody aircraft — they usually offer the most forgiving under-seat space.

8.2 Add your cat to the booking immediately

Don’t wait. Every airline has a limited number of pet-in-cabin spots per flight — usually between two and four.

Most airlines let you add the pet via:

• the app,
• the booking manage page,
• live chat, or
• a short phone call.

This is where your stress drops again: once your cat is officially on the booking, the whole trip becomes real and anchored.

8.3 Re-check your seat once your aircraft type is confirmed

Aircraft swaps happen. When they do, under-seat layouts shift too.

When your booking email shows the aircraft model:

• check the seat map,
• avoid bulkheads,
• avoid exit rows,
• choose a seat with a full under-seat space.

You’re not hunting for perfection — just avoiding avoidable surprises.

8.4 Screenshot everything

Take screenshots of:

• the airline’s official pet policy,
• your carrier purchase page & dimensions,
• your booking with the pet added,
• your seat assignment.

If you ever need to show an agent something, having it already saved removes a lot of pressure from the moment.

8.5 Keep the last week simple

Once the logistics are set:

• acclimate your cat to the carrier gently,
• keep your travel-day routine soft,
• and remind yourself that you’ve done everything correctly and in the right order.

Flying with a cat is less about juggling details and more about creating a stable path. You’ve just done that.

9. FAQs

9.1 What if my carrier is slightly larger than the airline’s limit?

A soft-sided carrier with 1–2 cm of gentle give often fits under the seat without stress, especially in middle seats. But think of this as an amber light: it usually works, but the airline is allowed to enforce the published number.

If you’re several centimetres over, it’s usually a sign to rethink the airline or the bag rather than pushing your luck on the day.

9.2 Do airlines weigh the carrier with my cat inside?

Some do, some don’t, and both are normal. KLM, Iberia, and Lufthansa Group tend to check the total weight. Delta, American, and many US domestic carriers often don’t.

Your safest plan is to pack light inside the bag and assume they might weigh it. If you’re comfortably under the limit, you remove almost all uncertainty.

9.3 Is a soft-sided carrier always better than a hard one for cabin travel?

Nearly always, yes.

Soft-sided carriers are kinder under real aircraft seats: they flex, adapt to curves, and don’t scrape against hidden boxes. Hard carriers are fine at home or in the car, but in cabins they often bump against the height limit.

If your airline allows both, soft-sided almost always leads to a calmer experience for your cat.

9.4 Can I choose a bigger carrier and hope the airline doesn’t notice?

It’s a tempting thought - especially if your cat is tall - but it adds more stress than comfort.

Airports are unpredictable, and relying on an agent “looking the other way” puts pressure on both you and your cat. It’s much kinder to choose:

• the right airline for your cat’s size, or
• a lower-profile soft carrier that stays within limits.

Your whole day will feel lighter.

9.5 What happens if the gate agent says it doesn’t fit?

First: breathe. You’re not in trouble.

Gate agents usually try to help before they refuse. They may ask you to:

• gently shift the carrier under the seat,
• rotate it,
• or compress the top slightly if it’s soft-sided.

If it genuinely doesn’t fit, their hands are tied. This is where choosing the right carrier and seat type ahead of time gives you the buffer you need.

9.6 When should I stop pushing for cabin and consider cargo instead?

A good moment to pause is when:

• your cat sits tall and can’t relax in a cabin-sized carrier,
• your airline has unusually strict size limits, or
• you’re flying ultra-long-haul with a cat who needs more space than cabin bags allow.

It isn’t a step down, it’s choosing the option where your cat gets the room, stability, and airflow they genuinely need.

9.7 Is it normal to feel worried about getting this wrong?

Yes. Every single person flying with a cat feels some version of this.

But you’re taking time, learning the details, and setting your cat up for a safe, predictable flight. Most journeys with cats are quieter and smoother than we imagine. Preparation makes the day feel much softer than the fear beforehand.

10. Sources (Official Airline Pet Policies)

Below are the primary-source links consulted for carrier dimensions, weight limits, and in-cabin pet rules. Airline policies change regularly, which is why the article includes a “Last updated” date near the top and encourages travellers to double-check before flying.

• KLM — Pets in Cabin
  https://www.klm.co.uk/information/travel-extras/pets
• Finnair — Travelling with Pets
  https://www.finnair.com/en/pets-onboard
• Lufthansa — Animals as Additional Carry-on Baggage
  https://www.lufthansa.com/us/en/animals
• Iberia — Animals in the Cabin
  https://www.iberia.com/gb/pet-travel/
• Qatar Airways — Travelling with Pets
  https://www.qatarairways.com/en/help/pets.html
• Turkish Airlines — Travelling with Pets
  https://www.turkishairlines.com/en-int/any-questions/travelling-with-pets/
• Air Canada — Pets in Cabin & Under-Seat Dimensions Chart
  https://www.aircanada.com/ca/en/aco/home/plan/medical-mobility/pets.html
• American Airlines — Carry-On Pets
  https://www.aa.com/i18n/travel-info/special-assistance/pets.jsp
• Delta — Traveling with Pets (Pet in Cabin)
  https://www.delta.com/us/en/pet-travel/pet-in-cabin
• WestJet — Pets in Cabin
  https://www.westjet.com/en-ca/travel-info/pets