L4key;
From Dogwatch's original post:
My son was due to fly from Manchester to Toronto this morning with Thomas Cook, he arrived at checkin two and a half hours before the flight to be told it was overbooked and it was unlikely he would fly today.
If you have a similar situation obviously 3 hours will be better than two, but ...
If you are worried, get yourself a copy of 261 and carry it with you.
Good luck!