Many airlines
use the excess space in the holds of their aeroplanes to carry cargo, for which they can make a lot of money (it's one reason why budget airlines can charge such low rates for their flights). If you're taking up room with your stuff (how dare you?!) then it reduces the amount of cargo they can take and therefore how much money they can make.

I'm not saying it's fair! But I think that's why they charge so much.
( thealternativefact, Mon 21 Jul 2008, 12:10, Reply)