Alright, let's name names on this one. RyanAir (the usual suspect) wants "£35/€35" for any carry-on bag (you're only allowed one) that is too big (£35 is worth €38, which is $57, so pay in € if you can, and save about $5), but they also restrict bags to "10kg" with maximum dimensions of 55cm x 40cm x 20cm. I just can't see a 737 filling the overheads with only 1 bag per passenger, when each bag weighs less than 22 lbs and is smaller than the standard 'roll aboard' that all US crew know so well.

I've NEVER seen a plane where the bins are full. I've seen plenty where the FAs called 'bins full', and they were, though with crew bags, jackets, and small personal items that could go under seats.

Who, other than RyanAir, would charge for a carry-on that won't fit b/c the bins are full (and do the bins really fill on RyanAir, considering the limits RyanAir puts on carry-on baggage already)?