we took my DGS when he was 2 1/2, brought his car seat, nap time, he hopped right in because that was what he was used to. Slept the entire trip. And it also put him level with the window so he could see out during takeoff, loved that! I purchased EBCI (flew SWA) for my DH. He got on and installed the seat. We boarded during family board & it was waiting for us when we got on. Does she not like her car seat? Does she fuss in the car in it?