A little escalator for anything that needs one, like an airport. Airports have lots, even wittle ol' Billings Logan International Airport has 2 pairs of them, one going up from security to the Terminal with newly renovated Concourse A and the still-being-torn-down-to-be-replaced Concourse B and one going down from the concourses to baggage claim, once you leave the TSA (Transportation Security Administration) secured area, which would be a pretty good job, they even have a $2000 sign-on bonus. You can use them for other things though too, I used it in a custom airport.