Originally Posted by
jiml1126
Domestic MAINLINE flight number changes to NW2000 - 2999 and NW7000 - 7999 only, eff 01NOV09.
The 7xxx range is for DC-9 flights only. All other flights on domestic equipment are located in the 2100-2999 range.
The separate range for DC-9s is because that fleet will get migrated from NW to DL systems first, as a test, before the other NW fleets.