The Boeing Monomail Model 221, a development of the Monomail 200 designed to accomodate six passengers. The Monomail was the progenitor of both the P-26 fighter and a long succession of Boeing airliners. (Boeing)
The Boeing Monomail Model 221, a development of the Monomail 200 designed to accomodate six passengers. The Monomail was the progenitor of both the P-26 fighter and a long succession of Boeing airliners. (Boeing)