Allegiant Airlines Approved Pet Carriers. Paws & pals airline approved pet carrier. Airline approved pet carriers under the seat.
Allegiant accepts live animals/pets (domestic cats and dogs only) in the passenger cabin of the aircraft. Definitely go soft sided though. I was on hold for 90 minutes and gave up.
We've flown a lot in canada and always use a soft sided carrier that's about 10.5x10.5x16.
The seat carrying bag is accompanied with a velcro handle and removable cushion padded shoulder strap for easy relocation. Territories, including san juan, puerto rico may not accept all pets. 18w x 14d x 9h. The airline does not require a health certificate for pets traveling in the cabin.