| 03/01/1985 | N501US | roll out. |
| 08/02/1985 | N501US | first flight. |
| 28/02/1985 | N501US | del Northwest Orient Airlines; '5501'; named "City of St. Paul". |
| 01/10/1986 | N501US | company renamed Northwest Airlines. |
| 16/04/1993 | N501US | at Boston in 1989 Northwest Airlines c/s. |
| 23/10/2003 | N501US | at Minneapolis in 2003 Northwest Airlines c/s (repainted after 12/04/2010). |
| 29/10/2008 | N501US | Northwest Airlines merged into Delta Air Lines. |
| 26/04/2010 | N501US | at Las Vegas in 2007 Delta Air Lines c/s with "Delta" titles (repainted after 12/04/2010). |
| 13/04/2013 | N501US | last service: Minneapolis-Phoenix as DAL999. |
| 14/04/2013 | N501US | ferried Phoenix-Marana as DAL9931 (TT: 87477 hours; 37138 cycles); for storage. |
| 25/10/2013 | N501US | at Marana; stored; missing both engines. |
| 15/12/2013 | N501US | at Marana; stored. |
| 05/01/2014 | N501US | at Marana in full Delta Air Lines c/s; missing both engines and front 2 doors. |
| 06/04/2014 | N501US | at Marana; stored. |
| 28/03/2015 | N501US | at Marana; stored. |
