Imperial Airways was created on 1924-03-31.
Imperial Japanese Airways was created in 1938.
Hellenic Imperial Airways was created in 2006-05.
Imperial Airways ended in 1939.
There is some Imperial Airways stuff at the Croydon Airport Society archive (http://www.croydonairport.org.uk/)
British Airways Ltd. ended in 1939.
Thomson Airways was created in 2008.
Westminster Airways was created in 1946.
MidAtlantic Airways was created in 2002.
Bluebird Airways was created in 2008.
Ambassador Airways was created in 1992.
Helvetic Airways was created in 2003.
Moscow Airways was created in 1991.