A small plane carrying aviation adventurer Steve Fossett has been missing since Monday night, federal officials said Tuesday. Fossett took off in the single engine Bellanca at 8:45 a.m. (1545 GMT) Monday at a private airstrip on a ranch in western Nevada and did not return as scheduled. A friend reported him missing, said Ian Gregor, a Federal Aviation Administration spokesman in Maryland. "The Civil Air Patrol is looking for him. One problem is he doesn't appear to have filed a flight plan," Gregor told The Associated Press. The search was being coordinated by the Air Force's Rescue Coordination Center in Langley, Virginia, Gregor said.