I frequently book YYZ-ATL and in the past it was always a flight number like 8620. A Colleague has already booked a flight and he has flight number 8627 on April 7. Now I need to be on the same flight as he is, and I find the same time but now flight is AC7556.
I assume this is a change of which regional partner is serving that route?
What's worse is for the return on April 11, he has AC8620 at 11:40 but this flight is no longer showing up, there is 7551 but much later in the day...
can anyone shed any light on this for me, thanks!