Montana's Big Sky Resort, whose 4,300 vertical feet and 5,500 acres of accessible terrain allow it to call itself "The biggest skiing in America," is now a short hop from the San Francisco Bay Area. The resort, in partnership with United Airlines, will operate weekly nonstop jet service from San Francisco International Airport to Bozeman, a 45-minute drive north of Big Sky. The first of these Saturday-only flights takes off Dec. 15, with the final winter flight scheduled March 29, 2008 (the resort also has a summertime SFO-Bozeman flight). To book a flight or to get more information, call Big Sky Central Reservations (800-548-4486) and ask to be connected to the air department.