| Line number | 0968 |
| Type | 251 W |
| Engines | Pratt & Whitney PW2037 |
| Mode S | A700AC |
| Configuration | F20W29Y150 |
| Name | |
|
| Date | Registration | Remarks |
| 12/05/2001 | N550NW | roll out. |
| 02/06/2001 | N550NW | first flight. |
| 19/06/2001 | N550NW | del Northwest Airlines; '5650'. |
| 20/06/2001 | N550NW | rgd to Northwest Airlines Inc. |
| 21/02/2005 | N550NW | at San Francisco in 2003 Northwest Airlines c/s (repainted after 28/08/2004). |
| 18/11/2006 | N550NW | last service: Detroit-Minneapolis as NWA757. |
| 19/11/2006 | N550NW | ferried Minneapolis-Marana as NWA9750 (TT: 16504 hours; 6337 cycles); for storage. |
| 03/03/2007 | N550NW | ferried Marana-Indianapolis as NWA9752. |
| 30/03/2007 | N550NW | ferried Indianapolis-Fort Lauderdale as NWA9750; in service: Fort Lauderdale-Detroit as NNWA251. |
| 29/10/2008 | N550NW | Northwest Airlines merged into Delta Air Lines. |
| 29/03/2009 | N550NW | ferried Minneapolis-Greenville (MS) as NW9861; for repaint. |
| 07/04/2009 | N550NW | ferried Greenville-Minneapolis as NWA9885 in 2007 Delta Air Lines c/s with "Delta" titles. |
| 31/12/2009 | N550NW | rgd to Delta Air Lines Inc. |
| 21/02/2016 | N550NW | at Fort Lauderdale with blended winglets (installed after 21/11/2015). |
| 27/03/2020 | N550NW | last service: Washington/DCA-Salt Lake City/SLC as DAL832. |
| 28/03/2020 | N550NW | ferried Salt Lake City/SLC-Victorville/VCV as DAL9936; for parking because of COVID-19 pandemic. |
| 02/01/2021 | N550NW | ferried Victorville/VCV-Jacksonville/VQQ as DAL9936; for maintenance. |
| 21/01/2021 | N550NW | ferried Jacksonville/VQQ-Atlanta/ATL as DAL9963. |
| 22/01/2021 | N550NW | ret to service: Atlanta/ATL-Phoenix/PHX as DAL861. |
unable to find out if this A/C (N550NW) had winglets added, most of NWA 5600 series B757-200 have, but not sure on this one.
As of November 21, 2015, the aircraft did not have winglets; N550NW photo proof