Airplane etiquette

I just read an interesting article on airplane etiquette entitled "The Middle Seat: So Who Gets the Armrest?" The article talked about the problems with planes these days and why people get so hot and bothered. I saw this first-hand on a flight back from LA last week when a couple with two kids became angry with a kind, older couple who had taken their seats because theirs (and mine) had been given away to other parents with young children. The older couple tried to explain but the dad just bluntly said, "get out of our seats, we have kids, just get out." The mother looked and sounded just as rude and obnoxious.

I was struck by how rude their behavior was and wondered what was up with this couple. Had they been traveling with two small kids from who knows what country and were exhausted? Had they had trouble on their previous flights and couldn't take anymore stress? Or perhaps I was too generous and they were just a nasty pair who treated people with disrespect. As I observed them for awhile, I tended to think it was the latter. Too bad for all that encounter this family. Most of the people on the flight seemed fairly together and kind. I tried to focus on that to keep from getting angry.

Have you had trouble on a flight due to bad behavior by your fellow passengers? How did you handle it?