It's annoying that Air Canada flies out of the 90s gates, but the United lounge is at gate 43. That means you have to go through security twice. #firstworldproblems
Sprawling airport that always seems to be ridiculously busy. Show up two hours early even with pre check. Good luck finding a seat near your gate. $9 for a kind bar and OJ. Ridiculous.
Make sure you know&pay attention to your gate# when getting on the shuttles. Also why would termA split up the gates like they do. Worst airport layout I've been to.