Two helicopters, 12 planes and 60 volunteers from the Civil Air Patrol and Washington Search and Rescue were trying to find the plane that took off from Boeing Field at about noon on Tuesday.

Video: Pilot Reported Trouble Before Jet Vanished

The pilot of the two-seat L-39 reported trouble minutes after takeoff and the plane then vanished from radar screens.

A spokeswoman for the Washington Aviation Division, Nisha Hanchinamani, said no emergency signal has been picked up.

The single-engine plane is registered to Rocky Stewart of Hollister, Calif., and was bound for Lewiston, Idaho.

Stewart's wife, Patti, said in a telephone interview she didn't know who would have been on the plane with her husband or any other details.

The plane -- used by the Russians for training -- is one of several bought by Americans, said Mike Fergus, a Federal Aviation Administration spokesman in Seattle.

The 40-foot-long jet was FAA-certified and the pilot was trained and certified to operate it, Fergus said.

Some of the planes' ejection seats remain operational, he said, and the pilot may have been able to find a place to land.

The jet's wing number was N39TJ, Fergus said. It was built in 1981.