Artist's concept of the North American Rockwell Next Generation Trainer (NGT) proposal found on eBay from 1978. The United States Air Force NGT competition would be won by the Fairchild T-46 "Eaglet".
North American Aviation - Rockwell International USAF Jet Trainer Concept Art.
I was fortunate to have obtained a number of ORIGINAL concepts from North American Aviation. This 1978 USAF twin engine jet trainer concept art shows a side by side twin jet in USAF high visibility orange and white paint scheme. Aircraft is similar to the Cessna T-37 in size with the exception of external engines. Size is @ 22"x18" and is labeled TSP78-9892 on #82 water color board