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Las Vegas, NV: In Vegas, you can gamble anywhere. There are over 120 casinos in the city proper and since gambling is legal in the state, you can pretty much find a form of gambling as easy as you can find a Starbucks.
Which is why
#44: Slot Machines At The Airport.
is one of the 100 Little Pleasures of (Touring) Life.
It's not a necessity that you NEED to gamble when you step foot off a plane or right before you say goodbye, but if you WANTED to, they make it very easy to lose your shirt.
Though technically, even though clothing is sometimes only a suggestion in Vegas, at an airport, I'm fairly certain you must be wearing a shirt.