I am assuming these are "nose" numbers. Not sure if this is new info after the Duracell debacle or if this has been updated since the new test flight schedules.
3/13 - 508UA
3/18 - 532UA (not going to FEDEX?)
4/13 - 527UA
5/13 - 506UA
7/13 - 573UA, 574UA
8/13 - 503UA, 507UA, 511UA, 515UA, 519UA, 554UA, 555UA
9/13 - 557UA, 560UA
11/13 - 525UA, 533UA
12/13 - 509UA, 544UA
Assuming this is right and it is 19 aircraft leaving by years end, we aren't getting that many aircraft this year to replace them. Some of the new -900's are replacing the last 737-500's that are being parked.