Pets in cabin: Dogs, cats, birds, ferrets, rabbits, hamsters and guinea pigs.
Cost: In-cabin fee is $50. Pets checked as baggage are $100.
Limit: Only one carry-on pet per passenger. Two pets are allowed in cargo.
Maximum pets per flight: Two in the main cabin.
Booking your pet: Call (800) 221-1212.
Carrier restrictions: The carrier must fit under the seat.
Carrier availability: None.
Special restrictions: Animals must be "non-offensive" and not pose a danger to passengers or baggage handlers.
Perks: The Delta Pet First service is intended to ensure animal safety and comfort. The airline has temperature-controlled live-animal holding areas in its four hub cities: Atlanta, Cincinnati, Dallas and Salt Lake City.
Pets in cabin: Small dogs and cats.
Pets in cargo: Not allowed, because of a lack of oxygen and pressurized air.
Cost: $50 each way.
Limit: One pet per traveler.
Weight: The combined weight of the pet and carrier can't exceed 20 pounds.
Maximum pets per flight: Four.
Booking your pet: Customers must call reservations and let them know they are traveling with a pet. Cannot use online flight check-in. (800) 538-2583.
Carrier restrictions: Must fit under the seat and have a leak-proof bottom.