I will always take too cold over too hot on a plane, but I am usually ok. The only recent flights that stand out to me were:

1. Austrian Toronto - Vienna last year, I was in the emergency exit economy row, and it was so cold they actually provided duvets (not the blankets the rest of the cabin had) to compensate.

2. Air Canada Toronto - Haneda a couple of years ago, it was ridiculously warm, in part, I think, because there were no real window shades (it was a dreamliner). The sun was beating down on the left hand side of the plane, I was on the right so although warmer, I was ok, but those on the left by the windows were not happy campers

3. Westjet Cancun - Toronto last year, it was stonkingly warm, and the woman in front of me asked the flight attendant if she could make the cabin a bit warmer because she was cold - she was in teeny shorts and a boob tube!