Cherry air and companies of the like don't make they money off volume they make their money off "on demand". Mostly car parts. When I worked in Del Rio several companies including Cherry air would come in almost daily. Several times a few of us would go across the river into Acuna, grab some lunch on them, then bring parts back to put on the planes. It cost the factories millions to go down for a day so when they need a specific part they need speed not size. I've seen them fly all the way out there, pick up a small bag of about 15 o-rings, then jump back into the jet and smoke it up to Detroit. No telling what those o-rings ran a piece.