I found my Flag Traveller Program card (I think that was merged into Worldpass?) and it is embossed with number, name and address.
I also found a May 1986 Worldpass bulletin announcing a partnership with AAdvantage and giving me two stickers with an AAdvantage number beginning with HL. I have never used this number. They asked for $25 to "renew" my Worldpass for 1986.