At the JFK airport in New York there are Kosher vending machines that serve hot food, like this Kosher Cafe Hot Nosh 24/6 where you can buy a potato knish, onion rings and fries. There are other machines that served hot dogs. The idea behind these vending machines is to be able to provide Kosher food to travelers in areas where it may not be available.
Here’s a New York Times article from last year about Kosher Vending Industries.
photo by Scott Beale