I have flown lots of years first with Toffee, and now with Mr.Darcy, and next time with him and Lizzie!!! Anyway - if you get a 'middle' seat, there is a plastic box under the seat in front of you (this is where you have to put the carrier), so the carrier doesn't go under far enough for some flight attendants. Window seats are good, as there is no obstruction......don't forget to point the 'air nozzle' down on the carrier - it can get hot and stuffy down there. They always tell me I can't open the carrier on the plane - so I wait until we are in the air, and unzip the top enough to get my hand in, and make sure my baby is OK!!! Also, if you are in the window seat, they can't see the carrier that well!