I don't look at this as an airport-specific issue, or even as a "going through a checkpoint" issue. This is an issue basic, everyday caution against pickpockets and sneak theives.

It doesn't matter whether I'm stripping down for a TSA checkpoint or paying for a double-layup-with-a-two-and-a-half-twist latte at Farbucks - I don't display my cash in public. I keep it neatly folded, with the smaller-denominations on the outside, and when I pull it out of my pocket to look at it, I do so discreetly and keep it close to the vest, as it were.

With other valuables, I am equally cautious. I carry my Kindle with me to many public places, including restaurants. Number One precaution: NEVER get up from the table to go to the bathroom or to get another plate of food at a buffet or anywhere else and leave my Kindle (or my phone, laptop, tablet, wallet, keys, or anything else of value) sitting on the table unattended. If I'm carrying a bag of any kind, the bag is never left unattended.

In an airport context, you're typically carrying carry-on luggage along with all of your regular EDC items, so you need to be careful to never let those items out of your control except when they go through the x-ray scanner, and never let them out of your sight, and always keep them locked. The best practice when transiting a c/p is to place all of your pocket items into your carry-on in advance, and lock it closed. This makes it much more difficult for a would-be thief to quickly pick up your wallet, phone, or iPad, and walk off with it casually.

Wherever you are, never get more than about 6' (2m) from your bag. Any more than 6' invites thieves to grab whatever they can from it and walk off, during any second or two that your attention is diverted by a conversation, a vending machine, a trash can, a flight status board, a TSO, or anything else.

The only real special issue at an airport is generally that you're carrying more, and you have to take everything out of your pockets at one point. But, as I said, take it out of your pockets in advance and LOCK it in your carryon, and any thieves who might be watching at security won't even see your stuff.