Passenger Makes Threat on Logan Runway (credit AP) A Delta Air Lines plane about to take off from Logan Airport was forced to halt Thursday after a passenger stood up and made a threat, authorities said. The airplane was on the runway and was supposed to head to Orlando, Fla. Instead it taxied back to the terminal area and its 118 passengers were taken off the plane. It is unclear what the passenger threatened, Logan spokesman Phil Orlandella said, but he stood up saying he wanted off the plane and the crew became alarmed. The man was being questioned and had not been arrested as of early Thursday afternoon, Orlandella said. The aircraft was checked. Security has been an issue at Logan since it was the starting point for the two hijacked airliners that destroyed the World Trade Center on Sept. 11. Officials have created a security web around the airport, including mobile handheld computers that allow state troopers to do instant background checks, and pilot testing of facial recognition systems. In addition, troopers now conduct random roadblocks to search vehicles, and clam diggers have been banned from shorelines along the runways.