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| Year | FTEs in thousands (000) |
|---|---|
| 1990 | 450.5 |
| 1991 | 439.1 |
| 1992 | 445.3 |
| 1993 | 441.1 |
| 1994 | 435.6 |
| 1995 | 429.8 |
| 1996 | 437.7 |
| 1997 | 379.7 |
| 1998 | 397.2 |
| 1999 | 417.4 |
| 2000 | 504.0 |
| 2001 | 538.7 |
| 2002 | 465.6 |
| 2003 | 460.8 |
| 2004 | 441.2 |
| 2005 | 428.5 |
| 2006 | 404.9 |
| 2007 | 407.9 |
| 2008 | 415.5 |
| 2009 | 392.1 |
| 2010 | 377.3 |
| 2011 | 382.8 |
| 2012 | 389.0 |
Source: Bureau of Transportation Statistics
Note: FTE calculations count two part-time employees as one full-time employee.