Originally Posted by
Fabo.sk
I've never seen carryons weighed at the gate, checked for size, yes, but not weighed. In any case the worst that will happen is they'll gate check it.
great, thanks for confirming.
I knew that calculator is inaccurate for checked bags if the first segment is on AC and the bags are checked through. I figured it would almost certainly accurate for carry ons but that it was possible they relax enforcement when the first segment is on a carrier with different rules where it's easier to imagine someone being caught by surprise.