I believe it is $25,500 for a two-year plan, and you get 25,000 miles each year in your account. You may purchase additional blocks of 5000 miles for about $2600.
You can get a five-year plan for about $65,000 with 25,000 miles added to your account each year.
It is actually cheaper than buying full fare tickets all of the time.
Plus, with AAirpass there are VIP benefits.... elite security lines, Admirals Club memberships, usage of all premium check-in and service lines, free alcohol on board the aircraft no matter what class, free inflight entertainment, special phone line, etc.