Join Date: Jan 2018
Location: Windsor/Detroit
Programs: AC*SE, Wyndham Dimond, Marriott Plat, Amex Plat CND & USA, active military, Yoga teacher.
Posts: 148
when you check in a LGA show them both flight you are on. They will check you in for both and check you bags all the way. I have done this 2 times before this year booking LH to AC and a different time UA to AC.
As for your bag when you land in YYZ from the USA and have a connection you will not need to get your bags or clear security. They have a different customs area for you. just walk down the hall until you see international connections.