At most airports there is a waiting list for hangar space. One way to increase the availability of space and reduce hangar rash caused by close quarters is the installation of Aero-Lifts. Think of them as bunk beds for airplanes, say its designers. One airplane sits on the ground while the other is safely and securely hoisted up above it in vertical space previously wasted. The Aero-Lift is manufactured by ARM Aerospace.