I was really worried when I flew our two cats from the UK to CH recently. They're both quite nervy and have never travelled well in the car but they travelled in the 'hold', not in the cabin, and arrived seemingly unphased by the whole experience. I think they probably just went to sleep. Them travelling separately also took a little bit of the stress out of our trip over, I'm not sure I could have coped with them howling at me through the flight on top of everything else :-) Good Luck!