YYZ-BOS: How Early to Arrive at Airport?
On Saturday the 28th I will be returning to the US on AC356. It departs at 8:50 AM. The YYZ website says to be at the airport three hours early for transborder. Is this good advice or overkill in the extreme?
I couldn't find this info in a search so I apologize if it's a duplicate. Thanks for your advice.