Books on African Aviation
All of these should be of help, but may be expensive due to being long out of print
REG Davies History of the Worlds Airlines UK Oxford University Press 1964
REG Davies Airlines of the Jet Age USA Smithsonian Institute 2011 ISBN 978-0-9788460-8-4
John Stroud Annals of British & Commonwealth Air Transport UK Putnam 1962
Encyclopaedia of African Airlines B R Guttery USA McFarland 1998
The Time Shrinkers David Jones UK David Rendel Ltd 1971 - development of UK - Africa services
Bringing Africa Together - Ethiopian Airlines Ethiopia 1988
Shadows Airlift & Air War Biafra Nigeria - Michael Draper UK Hikoki 1999 ISBN 1 902109 63 5
I have a spare of the Guttery available. I will send a PM