Cabin carrier size cheat sheet
Rough under-seat linear inch ceilings (length + width + height) used for soft cabin carriers on a few US airlines. Not cargo IATA crate rules.
Under-seat fit still depends on aircraft and seat. Breed bans, embargoes,
weight caps, and soft-vs-hard rules can block travel even when linear inches look fine.
These numbers change — confirm the airline’s current pet page before you buy.
| Airline | Cabin linear inches (approx.) | Official pet page |
|---|---|---|
| United | ~17" | United — traveling with animals |
| Delta | ~18" | Delta — pet travel |
| American | ~19" | American — pets |
| Alaska | ~17" | Alaska — pets |
International cargo / quarantine corridors often need a rigid IATA-style crate instead of a cabin soft carrier. Measure your pet standing; leave room to turn and lie down. Buy only after airline acceptance is clear.
Secondary shopping: Amazon crate search (affiliate tag faro80-20).