The U.S. Air Force is again holding joint exercises with Russia and Canada in Alaska's airspace.
KTUU-TV ( http://bit.ly/nxXDXK) reports this is the second year for Exercise Vigilant Eagle.
This year's scenario is of an American passenger jetliner flying over Alaska that is not responding to air traffic controllers and no one on the ground knows what's happening on board.
Under the drill, the Air Force scrambles F-15 Eagles to pull alongside the airliner to make visual contact with the pilot and hijackers to get control of the situation. Once the exercise is finished, the forces practice their response on a Russian airliner.