"You'll have to wait, *Sir*"

I love the witty social observation in this article of how flight attendants say 'Sir.'

"The intonation of that “Sir” will be familiar to many of you, a tone peculiar to American airline companies, one in which resentment, superiority, fear, contempt and impatience are coiled into a venomous parody of politeness — a three-letter expletive really — that stands the notion of service on its head and tells the whole dismal story of U.S. carriers in recent years."