- 137 DC-9-10 (all variants)
662 DC-9-30 series (all variants)
71 DC-9-40 series
96 DC-9-50 series
No DC-9-20s (all ordered by SK) are in service and only 4 still exist.
- 2 in derelict condition at CCS, last flown by Aeropostal.
1 stored by Thales since being retired from being a testbed in 2010
1 stored by Skydiving Perris at L65
No DC-9-40s or 50s in service either.
- The last operator of the DC-9-40 was Delta Air Lines, with frames inherited from Northwest Airlines that had flown since the 1960s; NW was in the process of phasing out that model when acquired by DL. The only DC-9-40 known to still exist is being used as a source for parts by 5V in Alaska.
The last operator of the DC-9-50 was either Delta or Aeropostal (DL operated the DC-9-50 into early 2014). There is one DC-9-50 properly preserved, N675MC, at the Delta Flight Museum next to ATL, and one used as a fire training plane in Minnesota. Besides the preserved frame at ATL and the stored one at TVF, there are 18 DC-9-50s in derelict condition in Africa, Iran, and the CIS; the remainder are scrapped.
All remaining frames in service are from the -10 and -30 series, and by country (here, I'll use the ICAO code):
Mexico: 9 (+ 1 due)
- VTM: 3 DC-9-10 (+ 1 due), 6 DC-9-30 (+ 2 stored, likely used for parts)
United States: 18
- AJI: 4 DC-9-10
JUS: 3 DC-9-10, 3 DC-9-30
KII: 2 DC-9-10, 1 DC-9-30
RTN: 1 DC-9-30
SKZ: 1 DC-9-10
US Government (includes the final DC-9 ever built): 3 DC-9-30 (+ 1 stored)
There is also an additional DC-9-10 that is owned by Glenn Beck whose registration expired at the end of 2018, that he put up for sale in spring 2018.
- EXZ/FFV: 2 DC-9-10 (+ 1 stored, likely used for parts)
AXK: 1 DC-9-30
ACF: 2 DC-9-30
VTS: 3 DC-9-30 (+ 1 stored, likely used for parts; there is also a DC-9-40 that is likely used for parts)
South Africa: 2
- GBB: 1 DC-9-30
PHB: 1 DC-9-30 (+ 1 stored)
Many others did fly all around the world, but are all retired now and scrapped or derelict, including a bunch in Venezuela (PAWA also operated the DC-9 until it went bankrupt). However, for a frame that has such short range, it's interesting that 27 of the 37 remaining DC-9s in service are operating in North America still, including 18 of the 37 in the USA. However, compared to the Boeing 737, the DC-9 (pre-MD-80) has much fewer frames in service. Does Boeing still provide support for the DC-9 compared to the 737? Is the fact that the 737 isn't a T-tail plane also a contributing factor? Also, with respect to stretches, why were the -40 and -50 not as popular as the -30? (Range limitations?)