Karl-Peter Griesemann, a prominent German businessman, was aboard the plane with three others, a spokesperson for Quick Air, an air charter company based in Cologne, told Reuters. Local newspaper Express reported that Griesemann was the pilot and that he was with his wife, daughter and his daughter's boyfriend. The jet "was flying between Spain and Cologne but when it changed course, air traffic controllers were not able to make contact," the Latvian civil aviation agency said... Fighter jets from Germany, Denmark and Sweden were scrambled to try to make contact with the crew in the air as the Austrian-registered plane...