Flying into St. Louis, the pilot radioed the control tower for a time check. The tower replied asking what airline. "What difference does it make who we are?"

"Well, if you're United we would tell you its 1500 hours. If you are Continental, the time is 3 PM. If you are Braniff, then the big hand is on the 12 and the little hand is on the 3. But if you're Ozark, its Tuesday."