I agree with all of the above but - take away the $10 baggage charge and make the prices the same so you don't have the tight asses trying to save a buck by cramming everything into a suitcase they hope will get past checkin. The same price regardless, bags or not, the way it used to be. Also start enforcing bag sizes, a check rack at the checkin counter that all carry on bags must be placed in, another 10 seconds per pax, with the line ups already there it would make no difference. Some of the flights I've been on I'm amazed the overhead lockers haven't broken off with the weight of bags in them, people struggling to lift their bags up and into the locker, jeez at times it's scary.
Oh and one other off topic thing while I'm having my rant, #$$^%&& that don't turn off their phones, if you catch 'em take 'em outside and shoot 'em.