Some time ago there were posts on r.a.h. about seat cushions.
Received a brochure today from "Gadget Alert", 1-800-429-0039,
www.gadgetalert.com.
In it they have a seat a interesting cushion.
TN335 Thermo-Sensitive Memory Foam Office Chair Cushion ($49.95)
Is both seat and back. Seat is 15" x 16" x 6"
You short folks might want to look at it. Could be the answer to your
problem while flying and other places?
Big John