| 12/07/1993 | N588UA | roll out. |
| 02/08/1993 | N588UA | first flight. |
| 16/08/1993 | N588UA | del & rgd to United Airlines; '5688'. |
| 09/02/2009 | N588UA | at Los Angeles in 2004 United Airlines c/s with "United" titles (repainted after 23/01/2009). |
| 02/05/2010 | N588UA | United Airlines agreed with Continental Airlines to merge into United Airlines. |
| 01/10/2010 | N588UA | United Airlines merged with Continental Airlines into United Airlines. |
| 07/07/2011 | N588UA | at Portland in 2010 United Airlines c/s with "United" titles (repainted after 00/04/2011). |
| 06/09/2013 | N588UA | at San Francisco with blended winglets (installed after 21/05/2013). |
