when you google the family names Sodipo and Omenai they are both Nigerian names. This is a good direction but I am fairly sure there were no airlines with this Logo in Nigeria at that time. Nigeria as a country is full of Eagle symbols so it does not narrow it down much.
I tried using the trademark lookup but I can't seem to get any good results...or really understand it hah.
Here is the link for anyone who wants to give it a shot...
http://tmsearch.uspto.gov/bin/gate.exe?f=tess&state=4802:rv0oxd.1.1
Still not sure if this is only for US trademarks though.