One World North America: This pass allows travel on the extensive network of American Airlines and a few of its regional partners, it can be a bargain if you are trying to travel to more remote areas of the United States but coverage in Canada is limited.

Star Alliance North America Pass: Air Canada, United Airlines, and US Air all participate in this program so there are very few destinations that are beyond reach.  Offers a good value to more exotic locations.

Skyteam Alliance Pass: This group of airlines offers some routings that differ from the others but offer comparable value to the other major alliances.

 

Horizon Air and Alaska Air Pass

These two airlines have entered a merger agreement and details of the Air Pass they will be issuing are still in the planning stage. Call one of the airlines to see if  the program has been finalized.

Discount Airlines: This is a region where discount airlines service a great many destinations and more value may be received from these airlines. The link above will search to see which airlines service your destination.