Thieves stole 1,000 feet of copper wire from the approach lighting at Sea-Tac Airport.

The Federal Aviation Administration told KING ( http://bit.ly/W4lddm) the theft last week has caused no flight delays.

The lighting is for a runway approach that is seldom used in winter. The wiring is being replaced.

Port of Seattle police are investigating.

FAA spokesman Ian Gregor told The Seattle Times ( http://bit.ly/YnjCJU) the metal thieves had to make it past two fences.