Pilots abort landings at San Francisco airport after spotting another plane on runway

Two airliners aborted landings at San Francisco International Airport after pilots spotted a Southwest Airlines jet taxiing across runways on which the other planes had been cleared to land.
The Federal Aviation Administration said the Southwest plane cleared the runways when the other planes passed directly overhead, and the decision to abort the landings was “precautionary.”
The National Transportation Safety Board said it is not investigating the matter.
The incident comes after a half-dozen close calls in recent months that are being investigated by safety officials.
The FAA is investing $100 million in improvements at 12 airports to reduce the number of “runway incursions,” when a plane or airport vehicle is on a runway when it should not be.