Nope -- AC on the way out, CO via CLE on the way back.
You can buy Duty Free after US Customs at YUL.... In fact, the exit from customs dumps you directly inside the duty free shop
Thanks. So that begs the question -- if you can shop duty-free after clearing U.S. Customs, how do they know whether you've exceeded your allowance? As someone who will have been in Canada for a grand total of two hours that day, I will only be entitled to bring 150 mL of alcohol back into the United States, rather than the normal 1 L allowance. If I try to buy a full-size bottle of liquor at the YUL duty-free, will I be barred or forced to pay duty on it?