I read this on the US Airways Pilots website:
"According to this projection the fleet count as of September 30 1999 was 405 aircraft which includes 11 727-200s operated on the Shuttle. By the end of 1999 the projected fleet count drops to 392 aircraft. This includes the addition of two A320s and seven A319s and the removal of seven 727-200s, five 737-200s, and 10 DC9s.
"The year-end total projected fleet count for 2000 is 418 aircraft. This projection includes the addition of seven A330s, 13 A320s, and 38 A319s and the removal of the remaining four 727-200s, 11 DC9s, and 17 737-200s.
"The year-end total projected fleet count for 2001 is 434 aircraft. This projection includes the addition of five A330s and 50 A319/320s, and the removal of the remaining 23 DC9s, 12 MD-80s, and four 767-200s."