aa would usually mean "americanapparel" (found at americanapparel.net).
I think alternativeapparel has a larger neck hole, but I think their blank t-shirts styles are more geared towards the "vintage" market.
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Technical gear - Does anyone here have any contacts for Under Armour type clothing? I have looked around and cant really find anything like those that are blank. | |  | |  | |
By technical gear, do you mean mostly the type of shirt that has "wicking" capabilities. Quick drying, repels moisture, etc?
If so, there are a few companies that offer this. Vapor Apparel is one of them. Wickd Wear is another. I also think SanMar.com has a few of them in their catalog.