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Bigger toilet stalls would be nice. When I go to the restroom, I don't want to leave my suitcase outside the stall, but often times the toilet stall just doesn't have enough space to fit both me and my luggage.

Another related problem - all airport stalls should have a built-in ledge behind the toilet for placing your personal items. Toilet floors are just dirty by nature, and I hate placing my luggage (assuming they re not on wheels) on a dirty toilet floor. often times I ended up placing the luggage on my leg.

Definitely the seats!! I just flew hawaiian air. I got into seatlle yesterday from Maui and I am still waiting for the feeling to come back in my ... and my legs...it was awlful and forget about trying to retrieve anything under your seat unless you can bend your neck in ways it is not meant to be bent.

It doesn't have to be that way. Just designate which bags are carryon and which will be checked when passing through security.

Then what would prevent someone from moving an item (prohibited from carryon baggage but allowed in checked baggage) from baggage to be checked to carryon baggage after passing security, unless the baggage to be checked is immediately sent off to the hold?