Originally Posted by
FlyingUsedToBeFun
My guess is that is the plan. When you come to the baggage drop off with your "carry-on", they will size and weigh it. If it does not comply, they will force you to send it as baggage AND charge for same.
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bolding mine)
AC quite sensibly does not have weight limit on carry-on, just size (whether it is enforced or not). I'm looking at an Agean flight that has an 8kg limit. That's nothing! I go on multi-hour runs with more weight than that in my pack!