Thanks for the replies. We also have one of those portable changing pads with pockets for supplies. I still can't bear the thought of putting that on the airline toilet seat cover and then touching it afterwards -- but if we must we will! We'll make sure to change him once before boarding. We may get lucky and experience no poopy diapers for this first trip to LA, but I am sure we'll have to deal with at least one nasty poopy diaper for the long nonstop flight to Maui later in the year, after he has started solids which I understand makes for very foul smelling diapers!