AA only flys the route seasonally. The general blurb on the AA website says June 1 - September 30 but it appears to be actually loaded in the schedules only from June 11. They used to fly from ORD as well as DFW but dropped that last year (or the year before?). Flights fill up quickly (the June 11 flight doesn't exactly have a lot of open seats in either F or Y) so if it's of any interest etc,. I would get in there while you can. It's 3,042 miles each way (on a 757 ... ouch). You're only allowed one roundtrip on an xONEx - I guess too much mileage running otherwise (not to mention those discounted D people taking up the paid F seats).
Guess I spoke too soon...no A availability on DFW-ANC in June/July, but lots of A availability ANC-DFW...weird! Lots of F availability and all other fares except A...frustrating!