Table 2,,, Intervention Analysis in STAMP on Passenger Time Series.,,, Passenger mode,AO 9/1/2001,TC 10/1/2001,LS 11/1/2001 ,,, Air RPM,Significant,Significant (decay rate = 8%),Not Significant Rail PM,Not Significant,Not Significant,Not Significant VMT,Significant,Not Significant,Not Significant "SOURCE: STAMP analysis, U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics.",,,