Originally Posted by
tentseller
I am not familiar with T1 as T3.
T3 intl departure CATSA can be a nightmare due to many passengers not knowing basic allowable on plane regulations. It can be quite a long wait.
At T3 US departure there is priority CATSA line for FF with priority status with their flying airline as printed on the BP. I have not tried T3 intl departure to see if thy have this priority line.
I would guess 90 minutes prior to departure at T3 would be a safe bet.
Thanks.
My choice is something just under 2 hours and 4.5 hours ... I might go with the longer connection just to be safe. With the shorter connection, I would worry about WX or MX delays followed by congestion in all the queues.