Imperial Airways ended in 1939.
Imperial Japanese Airways was created in 1938.
Imperial Airways was created on 1924-03-31.
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/)
Continental Airways ended in 2007.
Pakistan Airways ended in 2006.
Arizona Airways ended in 1950.
Mainline Airways ended in 2003.
Helios Airways ended in 2006.
Highland Airways ended in 2010.
Bosphorus Airways ended in 1993.