If by some small chance I haven't made it there before anyone else! then I'd bide my time by, (if I hadn't pre-booked), considering which seat I'd like. (I'll always go for the window at bulk, if possible). I'll take a look at my fellow pax, being that little bit more cautious these days; make sure my bags are tagged; have all my documents at hand, and probably just make sure I can impress on the check-in staff, in hope for the upgrade! At screening I'll go by the numbers, (metal objects in the tray, jacket off, be friendly, no stupid remarks like "what's that ticking"! it can really p155 those guys off, and they'll delay you for it too)! Then if I can, get some thru-the-dirty-terminal-glass-shooting done, before boarding commences!
EOS1D4, 7D, 30D, 100-400/4.5-5.6 L IS USM, 70-200/2.8 L IS2 USM, 17-40 f4 L USM, 24-105 f4 L IS USM, 85 f1.8 USM