My mom is a United F/A, and she said that UnitedNews and Update AFA (an employee service) said that the last 737-200 was retired on 12/15/98. United is in the process of retiring 727's, DC-10's and older 747's. The 737-300 and -500's will eventually be transferred to United Shuttle, sold, or retired. The mainline fleet will eventually consist of the A319, A320, 747-400, 757, 767, and 777. United Shuttle will have 737-300 and -500's. No info on United Express, as that is owned and operated by UAL Corp., and not United Airlines. Any more UA ?'s, ask.