Having been to the brewery (and I'd highly recommend going there, Monday Night, and Red Brick if you have a free day or two in ATL), they're a large enough operation now that they could probably put a dozen beers on every mainline DL flight to/from ATL each day.

But that would probably take away from the local supply, which I would not be okay with.

Makes me wonder, though - how are the unused drinks from each flight resorted? I assume they go back to catering and get sorted into a new cart, but does that mean that the same can of beer could theoretically get shuffled from cart to cart across multiple flights/days? Blech.