[Mitchell]

What about a possible Canada connection. The Ames strain is only known to have been given to 5 labs. The Ames strain used in the letters apparently was limited to only five labs - those are the US, Canada, and the UK. I'm looking for an article that mentioned the fact that Atta visited Canada often. Perhaps that's where the envelopes were stuffed.

I've not really seen much of a hint of a Canadian connection. (Porton Down in the UK has come under suspicion, however.)

One thing that occurs to me is that nobody knows why Atta and Alomari went to Portland, Maine, right before the hijackings, only flying into Boston first thing on the morning of 9/11. It must have been important, since it made their schedule very tight. What were they doing in Portland?

[Nogbad]

What were they doing in Portland?

Atta probably had to confer with his successor
filling him in on the details of the post 09-11 operations.