Moderator, Air Canada; FlyerTalk Evangelist
Join Date: Feb 2015
Location: YYC
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The YUL website doesn't seem to have a map, but that corridor is long and circuitous. Last time I was there, I definitely felt certain I would have been better to leave the secure area and head straight to US customs as it would have been more direct.
You have to re-clear security either way.