Flights briefly vanish from Austrian air traffic

The incidents on June 5 and 12 saw flight data disappear A total of 13 planes suddenly vanished from radars on two occasionsHappened over Austria - neighbouring countries also reported blackoutsIt is believed some of the planes were long-haul flights carrying passengersAir traffic control was carried out 'blind' - by voice - during outage A total of 13 aircraft suddenly vanished off radars for about 25 minutes on two occasions while flying over Austria, it has been revealed.