http://avherald.com/h?article=4ac1922a&opt=0
A Sun Express Deutschland Boeing 737-800, registration D-ASXD performing flight XQ-714 from Samsun (Turkey) to Frankfurt/Main (Germany), was enroute at FL400 over Slovakia when ATC lost radio contact with the aircraft,
the aircraft continued according to flight plan.
Fighter Aircraft from Pardubice were dispatched by the Czech Republic to intercept the aircraft while flying over Czechia, the aircraft restored radio communication thereafter.
In the meantime Germany's Airforce dispatched two Eurofighters to intercept the aircraft in supersonic flight, too, the fighter aircraft reached the Boeing near Hof (Germany) near the border between Czechia and Germany.
Czech Media reported on Jul 27th 2017, that two Gripen fighter aircraft had been dispatched from Pardubice and intercepted the Boeing near Karlovy Vary.
The fighter pilots established contact with the Boeing crew on emergency frequency, the boeing crew had a wrong ATC frequency selected and now established contact with Czech ATC on the correct frequency.
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