Your youth and inexperience is showing again...

UAL used to operate 44 747-400. They're down to 23 now. One other point, their network is different than ours, with a hub structure that should be able to support larger jets. Even in this airline economy they've been unsuccessful at doing that, and in June they had a complete revenue and finance management makeover. Also, their widebody order book is, in general, for smaller aircraft than they're currently operating (787 and A350).

UAL has lagged Delta 1-4 years in making decisions and accomplishing goals. Look for their fleet changes to accelerate in 2015 (they've just started the regional restructuring Delta began in 2012). If/when they ever get their act together they will be a phenomenal competitor.

United Continental Holdings, Inc. - Investor Relations - Fleet Information

UAL 2003 (page 11)