If the three-letter airport identifier appearing on baggage tags and tickets for Fresno (FAT) caused problems with one overweight passenger, the identifier initially assigned for Sioux City, Iowa, caused even more trouble. It came under attack from state officials until the Federal Aviation Administration agreed that SUX was an unacceptable abbreviation for the facility.
Years ago at Gatwick (LGW) when it wasn't the sophisticated airport it is now an American passenger said to me. "LGW, what's that stand for Long God’amn Walk?" He'd think it was a stroll these days if he flew into Heathrow and his flight was parked on one of the many farther away stands. I’ve a theory that much of Heathrow is actually in Hampshire and they’ve just joined it up with travallators and undercover walkways.