There should be a link on Delt's site for ASA. It's something like
www.delta.asa.com. Just look around and you'll find it. I think there is a route map on there.
Having been at another airline for 5 years and now at ASA, I feel I can give a pretty good opinion based on my experience with training, without it being tainted by koolaid or with rose colored glasses.
Training was well organized and laid back. Not difficult as long as you put forth some effort. The contract is lacking, but you have to keep in mind that it is an old contract. Pay is still on par or above current industry pay rates. Work rules and scheduling needs to be reworked, and I think those issues will eventually be addressed. Travel benefits are the best in the industry. The people have been great as well.
No place is a utopia. Take every thing into account, what is important to you i.e. quality of life, where you want to live, time to upgrade, type of flying, etc., then make a decision. Just be informed so you aren't surpised by crappy domicile, pay, per diem or work rules, etc.
And after you have done all that, remember that it can all change overnight.
Good luck.