Lifting off in a small-engine plane, feeling the ground let go and lighter currents take over as an engine thrums you through the atmosphere, is a reminder that flying can be beautiful. Americans used to the dehumanizing experience of commercial jet travel — with the pawing inspections of the Transportation Security Administration and recent beatings on flights offered by United Airlines — may need a reminder. The pilots of the Cracker Fly-In are offering one this Saturday, when they show off their aircraft and offer paid rides beginning at 7 a.m. at the Lee Gilmer Memorial Airport in Gainesville.