Cargo Aircraft Designations - A comprehensive resource for US Army/USAAF/USAF cargo aircraft from 1924 to the present day. URL: http://home.att.net/~jbaugher3/cdesig.html
FAS: Airlift Cargo Aircraft - Current news and statistical information on modern U.S. military airlifters. URL: http://www.fas.org/man/dod-101/sys/ac/lift_comp.htm
The Aviation Zone - Dedicated to military transports, aerial tankers, and fixed-wing gunships. URL: http://www.theaviationzone.com/
U.S. Army Otter Caribou Association - Dedicated to the U.S. Army DeHavilland Otter Caribou aircraft and those who flew or supported these planes. URL: http://www.otter-caribou.org
