"May 21, 2000
On May 4, Boeing confirmed that American Trans Air had signed an intent to order 10 Boeing 757-300s and 20 Boeing 737-800s. ATA plans to lease an additional 17 737-800s - 12 from ILFC and 5 from GECAS. The new 757-300s will replace 6 L-1011-50s. ATA plans to keep all long range -100s and -500s at least until 2005. The airline is considering the Airbus A330-200 or Boeing 767 as a future replacement for the L-1011s. "
This was an excerpt from information from Lockheed's Tristar Alliance, a consortium whose genesis is based on operating the -1011s well into the twentieth century with proper maintenance, and the ability to convert 535-E4s to the #2 config on the tristar.
The enigma in my mind is based on this article, which seems implicitly hypocritical. To operate 738s, and 753s (with a tendency to replace the L1011-50s), why would they operate choose the A330 instead of a 764?