I've been looking to the Internet for advice on travelling with babies, and found a couple of useful sites - Flying With Kids and some ivillage pages. The latter has this amusing and probably very true, piece of advice:
Don’t keep apologising to child-free passengers. They hate you anyway. Saying you’re sorry when your offspring pings his plastic spoon over the seat is not going to create a beautiful friendship. Oh, and if it still goes belly-up, cheer yourself up with the thought that, in 16 years or so, your baby won’t want to go on holiday with you anyway.