A United Airlines cross-country flight was cut short and the jetliner made an emergency landing in Denver after one of its wings was damaged. A passenger on the San Francisco-to-Boston flight on Monday (February 19) said he had just put in earbuds and started to doze off when he felt the plane shaking.A United Airlines cross-country flight was cut short and the jetliner made an emergency landing in Denver after one of its wings was damaged. A passenger on the San Francisco-to-Boston flight on Monday (February 19) said he had just put in earbuds and started to doze off when he felt the plane shaking.