Some of the clips in "Up in the Air" mentioned above are good, but as a slushy sentamentalist I can't help but choose the opening scene of "Love Actually" which is filmed at Heathrow......
"Whenever I get gloomy with the state of the world, I think about the arrivals gate at Heathrow Airport. General opinion's starting to make out that we live in a world of hatred and greed, but I don't see that. It seems to me that love is everywhere. Often, it's not particularly dignified or newsworthy, but it's always there - fathers and sons, mothers and daughters, husbands and wives, boyfriends, girlfriends, old friends. When the planes hit the Twin Towers, as far as I know, none of the phone calls from the people on board were messages of hate or revenge - they were all messages of love. If you look for it, I've got a sneaking suspicion... love actually is all around."