And if you or your crew uses KCM, FOR THE LOVE OF GOD make sure they arrive at the checkpoint prepared to scan, show and move on quickly.
The seconds you spend digging through your man-bag, or your purse, then casually scanning your ID and the "pleasantries" like "Hows your mom? Oh we're flying to Akron!" adds up to minutes and adds delay. Kind of like rubbernecking on the freeway at an accident, you've just caused a 20 mile ongoing "ripple" on the freeway that can last for hours.
Have your crap out and ready to go. Period. I don't even care why you didn't, if you don't, step the hell aside.
My biggest pet peeve are ourselves.