Why would Croatians want to shoot down an airliner? Loads of airlines fly there.
There's loads of places US carriers don't fly to cos of high traffic but low yield - not just most of eastern Europe, what about AFRICA?! Is there a single service to Africa by a US airline (Cairo notwithstanding, and that's only TWA 767s)? Pan Am used to fly to Nigeria (Lagos, maybe Kano too?), Monrovia, Liberia (with 747s!), Nairobi, Kenya and others, including Cairo of course. They also flew to Addis Ababa in Ethiopia during the 60s. Maybe Khartoum in Sudan too?
fly Saha Air 707s daily from Tehran's downtown Mehrabad to Mashhad, Kish Island and Ahwaz