The following information has been collected from the airlines’ published pet policies, supplemented (in some cases) by telephone inquiries. It was last updated on February 4, 2012.

For each airline, I have provided a link to the airline’s pet policy. Please note that the policies include details that I can’t fit into this chart. For example, some countries do not allow pets to arrive in-cabin (including the U.K., South Africa and Australia). Because of airplane cabin configurations, in-cabin pets won’t fit at all under some sections’ seats. Information like this varies by airline, so read the policies carefully. If you still have questions, call your airline’s contact number and get answers before you arrive at the airport.

It is also a good idea to print out a copy of your airline’s policy, so that if a dispute arises with a ticketing or gate agent, you will have the actual policy to refer to (not the agent’s potentially faulty memory of the policy).

Notes:

1. “A transport cage may contain up to five animals of the same species as long as the combined weight (including food and the carrier itself) does not exceed 8 kg.” (Alitalia)
2. “The kennel may contain two (2) dogs or two (2) cats but they must be the same species, at least 8-weeks old, and the pet and container can weigh no more than 20 lbs. combined.” (American)
3. “Two pets of the same type may be allowed in one kennel, for example two dogs or two cats. They must be small enough to fit in one kennel provided they are compatible and must be of the same species and size, and they must meet the requirements of acceptance.” (Delta)
4. “In the case of animals of reduced size or weight, several of the same species may be admitted in a single container.” (Iberia)
5. “Each passenger is allowed to carry only one pet. However, pets under 6 months of age can be transported in a pair using a single cage (the pair must be of the same breed, i.e., 2 dogs, 2 cats, or 2 birds to a cage).” (Korean Air)
6. “Each passenger may only bring one animal carrier on board. However, the carrier may contain more than one animal of the same kind.” (TAP Portugal)
7. “A  maximum of two dogs may share the same cage, but two cats cannot be placed in the same cage. A maximum of 3 live animals having the same mothers and are aged up to 6 months old may be carried in the same cage.” (Turkish Airlines)