These include Austrian Airlines, Hungary's Malev, Greece's Olympic Airlines, Serbia's JAT, Italy's Alitalia, Slovenia's Adria Airways, Turkish Airlines, British Airways and Bulgaria's Hemus Air.
Bunlar arasında Austrian Airlines, Macaristan Malev, Yunan Olympic Airlines, Sırp JAT, İtalyan Alitalia, Sloven Adria Airways, Türk Hava Yolları, British Airways ve Bulgar Hemus Air yer alıyor.