Originally Posted by
moondog
We've discussed last minute equipment swaps (and flights becoming undelayed or less delayed as a result) here in the past, but that's such a rare occurrence, at least IME, these days that i don't even think about it anymore (i.e. they are not going to pull an identical 737 off of their ATL flight just so I can get to DCA faster, even if the DCA flight is more heavily subscribed).
I had this very thing (plane pulled from one route and put on another) happen to me on UA within the last couple of months.