United would never do this....
Yesterday, while flying from Louisville to ATL, my wife reported that they had to divert to Knoxville (TYS) because of bad weather in ATL. After sitting in the bull pen for an hour they ran out of water, etc. All of a sudden, the front door opens and the flight attendants start walking back with boxes and boxes of pizza and bottles of water. Everybody got at least 1 slice. As my wife said, it was great PR.
The airline, of course, was Delta.