B-18 assembly line

Credit - U.S. Air Force photo

Douglas B-18A Bolo

Credit - U.S. Air Force Museum

Women at work on Douglas bomber

Credit - Library of Congress

A-20 attack bomber at Douglas plant

Credit - Library of Congress

Douglas A-20G Havoc

Credit - U.S. Air Force Museum

Douglas A-26C Invader

Credit - U.S. Air Force Museum

AD/A-1 Series, Skyraider attack bomber

Credit - Boeing

C-74 Globemaster I military transport

Credit - Boeing

XF3D-1 airplane

Credit - U.S. Navy photo

C-124, Globemaster II military transport

Credit - Boeing

A3D-1 Skywarrior

Credit - U.S. Navy photo

Skyhawk takes off

Credit - U.S. Navy photo

C-133, Cargomaster military transport

Credit - Boeing

DC-4

Credit - Boeing

DC-5

Credit - Boeing

DC-6/C-118 Liftmaster commercial/military transport

Credit - Boeing

DC-7 commercial transport

Credit - Boeing

Skyray landing

Credit - U.S. Navy photo

DC-8

Credit - Boeing

C-9A interior

Credit - Boeing

Model 188 airline demonstration

Credit - Boeing

DC-9

Credit - Boeing

DC-10

Credit - Boeing

Donald Douglas

Credit - Library of Congress