Due to Turkey’s restrictions on flights between Aleppo and Yerevan, the air routes developed as follows:
Red line, represents the oldest route, which took 4 hours to reach Yerevan. It was during the cold war, and as to me, American bases was the forbidden areas to flight over.
Yellow line, took 2,5 hours, it was a later development during eighties.
Green line, is the shortest way, which is now used. It is 780km directly line drawn, declared 850, due to airplane route-curves.
I have flewn all the routes.
N.B.: This article I have posted upon Rami’s question.