I'm back; but not with any great expectations of finding this "little mysterious-biplane-not-from-Mexico challenge", with the current information!!
Am I wasting my time looking for it in the "Fright Archives"??
Greater than 6000 miles (statute or nautical?) and less than what?? As it still leaves two thirds of the globe and an awful lot of "not the usual suspect" aircraft building countries within a possible 20 year time span