Here's what I believe to be an accurate breakdown on our MD-90 fleet, as well as what's left to be had elsewhere in the world

In Service:
Manufactured for Delta: 16
Acquired from Hello: 3
Total: 19

In Mod:
China Eastern: 9
Blue 1: 5
China Southern 1
Total: 15 (running total 34)

On Order:
China Southern: 12
Hello: 3
JAL: 9
Total: 24 (running total 58)

Total Remaining, world wide:
Eva Air 3
Lion Airlines 4
Uni Air 8
JAL 7 (running total 80)
*Saudi Arabian Airlines 29 (running total 109)

As far as pilot staffing goes, these airframes put us slightly above the number of total mainline airframes we currenty have actively flying, after accounting for the retrement of the remaining -9's (Currently just the 30 -50's are flying, and they are scheduled for retirement by Year end 2012. Subject to change, of course. This was from network at a base meeting last month.) The stage lengths are also longer than the 9's they are "replacing," - so barring any major capacity reductions this should not result in a decrease in pilot staffing. More likely to do the opposite, but time will tell...