The suspect, 48, whose nationality is not yet reported, denies his guilt, Gossner said.
Prosecution is checking the alibi of the man arrested near Clotin on Wednesday.
In that city the Skyguide air traffic controller was killed on Tuesday. He had been held found responsible for the July 2002 air crash above the Bodensee. In that crash a Russian passenger plane Tu-154 and a cargo plane Boeing-747 collided. In the crash 71 people, mostly schoolchildren from Bashkortostan, who headed for holidays in Germany, died.