We flew American Airlines from Seattle to Dallas,TX round trip. Both ways the staff was absolutley amazing. On the flight out of Seattle the flight attendant at the counter gave us 3 seats since the flight was underbooked, she said if we wanted we could keep our dogs in the seats or have space for them so they don't have to be under the seat.
At the airport they were all friendly, all they needed was the vet health certificate.
We had to pay a fee for them both ways but it was well worth it!
One time the guy in front of us sneezed and Lil' Daisy barked at him, eveyone just started laughing saying how cute she was. Beckham slept both ways very calm.