| 06/09/1990 | N521UA | roll out. |
| 02/10/1990 | N521UA | first flight. |
| 16/10/1990 | N521UA | del United Airlines; '5421'. |
| 16/10/1990 | N521UA | bt UT-A3100V Inc.; opb United Airlines on lease. |
| 28/09/1990 | N521UA | bt Cumberland Leasing Company; opb United Airlines on lease. |
| 10/02/2009 | N521UA | at Los Angeles in 2004 United Airlines c/s (repainted after 25/10/2008). |
| 02/05/2010 | N521UA | United Airlines agreed with Continental Airlines to merge into United Airlines. |
| 01/10/2010 | N521UA | United Airlines merged with Continental Airlines into United Airlines. |
| 27/02/2011 | N521UA | at Las Vegas in 2010 United Airlines c/s with "United" titles (repainted after 25/11/2010). |
| 18/03/2013 | N521UA | bt & rgd to United Air Lines Inc. |
| 06/07/2014 | N521UA | last service: Portland-San Francisco as UAL367. |
| 11/07/2014 | N521UA | ferried San Francisco-Victorville as UAL2148. |
| 08/08/2014 | N521UA | bt & rgd to Federal Express Corporation; to be used for parts. |
| 08/08/2014 | N68087 | registration reserved by Federal Express Corporation. |
| 03/09/2014 | N68087 | Federal Express Corporation; re-rgd. |
| 12/02/2018 | N68087 | at Victorville. |
| 01/02/2019 | N68087 | not seen at Victorville; presumed scrapped. |
SoCal Spotters most recent Victorville storage update ( https://socalspotters.net/2019/02/21/victorville-storage-update-1st-february-2019/ ) no longer lists this aircraft – possibly scrapped.