The FAA is investigating another scare in the sky.
An Alaska Airlines 737 jet filled with 145 passengers and five crew members nearly collided with a cargo jet on Tuesday.
At their closest point, the NTSB tells CNN the planes were both at 1,400 feet and a quarter of a mile apart.
Officials say air traffic control did not warn the planes, but Alaska Airlines tells CNN the collision avoidance system alarm on the 737 did go off.
OutFront, CNN Aviation Analyst Mary Schiavo.