It definitely was at one point. That's why travel agents call it a record locator.
From: The IBM z/VM Operating System [mailto:IBMVM@LISTSERV.UARK.EDU] On Behalf Of Phil Smith III Sent: Monday, July 11, 2011 12:46 PM To: IBMVM@LISTSERV.UARK.EDU Subject: TPF and PAX numbers A long, long time ago (> 20 years), someone told me that the six-character PAX number on an airline reservation was actually a TPF database record locator. Can anyone confirm or deny this? ...phsiii