To expand on Mr. Silagi's identification and history of the pictured aircraft as N767TW c/n 20258, I can add that was built as line number 276, and first flew on February 12 of 1971.
The aircraft was delivered to Lufthansa on February 18, 1971, and named "Darmstadt". It was transferred to German Cargo Services in May of 1990 (which was then renamed as Lufthansa Cargo Airlines on May 1, 1993). Air Atlanta Icelandic leased it on September 16, 1994 (reregistered it as TF-ABF) and promptly leased it back to Lufthansa.
As for it's ending up in Ameristar's hands, my source is dated August 1997, so it transferred since that time.
Tom in NO (at MSY)
"The criminal ineptitude makes you furious"-Bruce Springsteen, after seeing firsthand the damage from Hurricane Katrina