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Sorry for what is probably a long post but it's hard to narrow down more than this. 48 hours at the new Istanbul Airport last September yielded several new airlines for me. Here's a small selection the full album is here https://flic.kr/s/aHBqjAdaXv
But that is a dodgy group of sanctions busting airlines that are still allowed there. How many of those airlines are still supported by the Original Equipment Manufacturer and what is the quality of the smuggled parts that manage to keep them in the air.