Pohanka said Thursday that several neighboring countries had similar incidents and the EU's Eurocontrol and European Aviation Safety Agency has been asked for a probe. He did not identify the other nations. But the daily Kurier said flight controllers in Munich and Karlsruhe in Germany, and in Prague, the Czech republic also reported related problems.
Kurier cited unnamed experts as saying interference between the aircrafts' transponders and ground control was apparently to blame. Pohanka declined to confirm that or to say which airlines and planes were involved. But he suggested that at least some may have been long-distance passenger aircraft, based on their high altitudes.
There was no danger at any time, he said. Pohanka said extra air controllers immediately were called to their posts and emergency measures, including establishing voice contact with the pilots and widening flight corridors, were put into effect.
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