Southwest Airlines and wholly owned subsidiary AirTran Airways are offering new nonstop routes as part of an extended flight schedules for travel bookings through Nov. 2, 2012. Southwest announced new nonstop service between Detroit and Las Vegas and AirTran set new nonstop service between Des Moines and Chicago Midway.

In addition, Southwest will now operate two daily nonstop flights between Atlanta and San Francisco as it transitions this route from an AirTran-operated city pair to one operated by Southwest. Southwest also will begin one daily nonstop flight between Atlanta and Orlando, with AirTran continuing its nine daily flights between these cities.

To celebrate the new route between Detroit and Las Vegas, Southwest launched a $99 one-way fare sale for the flight. Customers can purchase the low fares through Feb. 27, 2012, for travel between Sept. 30 and Nov. 2, 2012. In addition to low fares, Southwest Airlines allows customers to check two bags for free (weight and size limits apply) and doesn't charge a fee to change a ticket.

Sale fares are available only on southwest.com or swabiz.com. One-way fares can be purchased from Feb. 20 through Feb. 27, 2012, 11:59 p.m. PT, for travel between Sept. 30 and Nov. 2, 2012. Displayed prices are inclusive of all government taxes and fees. Seats are limited and fares may vary by destinations, flight, and day of week and won't be available on some flights that operate during very busy travel times and holiday periods.