The United Airlines fleet remained in march 2009:
26 Boeing 747-400
35 Boeing 767-300ER
52 Boeing 777-200 (ER)
And narrow-body aircraft:
97 Boeing 757-200
But the number of Boeing 737-500 aircraft declined to only 9 aircraft.
They still used 25 Boeing 737-300.
From Airbus they used 97 A320 and 55 A319.
The United Airlines fleet remained stable since 2005.