Originally Posted by http://www.thebookladysblog.com/2008/10/07/an-evening-with-david-sedaris

Another highlight occurred when Mr. Sedaris read entries from the diary he keeps as he travels. He told us about a flight attendant he met at one booksigning who told him that she and the other flight attendants relieve their gas pains (caused, she claimed, by air constriction at high pressure and altitude) by farting as they walk up and down the aisles of the plane. The noise from the engine covers it up, and passengers always assume it’s coming from other passengers. “We call it cropdusting,” she told him.