| 17/11/1998 | N597UA | roll out. |
| 07/12/1998 | N597UA | first flight. |
| 11/01/1999 | N597UA | del United Airlines; '5597'. |
| 12/01/1999 | N597UA | rgd to United Airlines Inc. |
| 29/03/2008 | N597UA | at Los Angeles in 2004 United Airlines c/s with "United" titles (repainted after 22/12/2007). |
| 02/05/2010 | N597UA | United Airlines agreed with Continental Airlines to merge into United Airlines. |
| 01/10/2010 | N597UA | United Airlines merged with Continental Airlines into United Airlines. |
| 30/03/2011 | N597UA | at San Francisco in 2010 United Airlines c/s with "United" titles (repainted after 06/02/2011). |
| 02/10/2012 | N597UA | at Los Angeles with blended winglets (installed after 04/04/2012). |
