Imperial Airways ended in 1939.
Imperial Airways was created on 1924-03-31.
Imperial Japanese Airways was created in 1938.
Hellenic Imperial Airways was created in 2006-05.
British Airways Ltd. ended in 1939.
There is some Imperial Airways stuff at the Croydon Airport Society archive (http://www.croydonairport.org.uk/)
MidAtlantic Airways ended in 2006.
Ambassador Airways ended in 1994.
Britannia Airways ended in 2005.
Zambia Airways ended in 1994.
Tennessee Airways ended in 1987.
Linus Airways ended in 2009.
SkyStar Airways ended in 2009.