Originally Posted by
bafan
Exactly. Stop charging for hold bags and start charging for [large] cabin bags for the most basic fares, and the problem would be solved overnight.
Aer Lingus - an airline in the IAG stable of course - seem to have moved to doing exactly this (I don't know how widespread it is, if it's restricted to certain types of fares, routes etc) so they will have plenty of data-points on this within the corporate group to base any decisions on...