LIVE: Czech Airlines #OK520 has declared an emergency - cause unknown

1. AIRLIVE.net @airlivenet

   UPDATE Czech Airlines #OK520 is diverting to Frankfurt https://twitter.com/airlivenet/status/770504073506324481 …

   1h
2. AIRLIVE.net @airlivenet

   LIVE: Czech Airlines #OK520 has declared an emergency - cause unknown via @planefinder pic.twitter.com/iZW3HsDWsU - @NikPhillips666