US: Officials probing additional runway incidents in San Francisco

US officials are investigating two more incidents at San Francisco International Airport where planes could have wound up on the same runway, the NTSB said Monday. The incidents include an event in December 2016 when a SkyWest plane crossed a painted runway line it was supposed to stay behind while another plane was taking off, according to a safety board preliminary report. The safety board report also revealed that a Compass Airlines plane in February was forced to abort a landing because a Virgin America jet was lined up and waiting to take off on the same runway. Air traffic controllers received a warning about the potential conflict from an automated system and were able to redirect the Compass plane in time. Both incidents happened at night, and there were no injuries in either case. News of the investigations emerged a month after an Air Canada jet ignored or did not receive instructions to abort a landing.<br/>