21.   Carmody said pilots leaving other airports for Aspen had received the notice, but controllers at the Aspen airport had not, and were not warning incoming pilots.

22.   Carmody said pilots had been notified against night instrument landings, but that contollers at the Aspen airport had not been and was not warning pilots.

23.   He declined to say whether this tentative sign was passed along to commanders in the region who might have been able to warn the pilot.

24.   He said flight controllers might have seen on radar that the plane was too low, and warned the pilot by radio.

25.   In both cases, on-board collision alert systems warned the pilots, who took emergency action.

26.   Tampa controllers warned the pilots of the Southwest Airlines jetliner and they quickly slowed their climb, said Joe Formoso, the head of the controllers union.

27.   The control tower tried to warn the pilot but was unable to communicate with him for three minutes, RCN said.

28.   The pilots were also warned in a preflight briefing report that the runway was closed.

29.   The controller is then supposed to warn the pilot by radio.

30.   He called for automated systems to warn pilots of dangerous ice accumulation on the wings.