Maybe he needed the AA# in order to book online as well as purchasing tickets for his friends?

This brings up an interesting cultural point. We've always felt that once people come to live in the U.S., they will be converted to enjoy our way of life. Here's an obviously intelligent person, not crazy like a serial killer, but firmly rooted in his hatred for the U.S. and determination to carry out his mission. It's so unbelievable!