ANCHORAGE, Alaska — The Federal Aviation Administration is investigating after an Alaska Airlines jet was told to abort its landing because another plane crossed the runway.

FAA spokesman Ian Gregor says an air traffic controller had Flight 157 make another approach to Anchorage Ted Stevens International Airport on Saturday after a chartered Boeing 737 taxied across the runway without authorization.

The plane landed on the second attempt.

Gregor said in an email that the "go-around" is a routine procedure to maintain safe distances between aircraft.

The two planes were about a mile and a half apart when the go-around order was issued.

Alaska Airlines spokesman Paul McElroy says there were no injuries to the 157 passengers or six crewmembers aboard the Los Angeles-to-Anchorage flight.