That depends on your perspective. I don't remember the precise times, but we had around a 3 hour delay, and then they pulled an aircraft from another flight that was scheduled to leave around the same time we were. Once they did the aircraft swap, our delay was down to around 30 minutes. The swap happened around when boarding was scheduled to start for our original departure time. The flight they swapped the aircraft with did show the same delay we originally had. So was it ample heads up? If you were at the airport paying attention, yes. If you chose to stay at home a while because of the original multi-hour delay? Not so much.