DD2 has now taken to sucking on her fist when she's dropping off to sleep sometimes, but usually she prefers to yell about the whole thing. Not a sucky baby, except at night time when she can get into a bit of a gentle 'don't leave me' suck that keeps me there but isn't actually doing anything.

Just remember that your crying baby usually sounds louder to you than anyone else. And it's not like you'd do it on purpose to annoy everyone on the flight. They'll get over it if you can't settle her quickly.