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To mark their union, Frontier and Midwest have synced up on airfare promotions for travel to Denver, Las Vegas, Orlando, and Washington, D.C. AirTran, American, Continental, Delta, United, and US Airways also compete.

Qantas' Australia and New Zealand sales feature flights to Auckland, Brisbane, Melbourne, and Sydney from both coasts and cities in between. Also look to Air New Zealand, United, and V Australia for competing rates.

Only valid for one day, Spirit's latest sale has discounted fares to domestic and Caribbean destinations such as Boston, Myrtle Beach, Nassau, and Santo Domingo. Available to the airline's fare club, the round-trip rates start at $18.

This destination-specific sale features travel between Denver and nearby cities like Las Vegas, Los Angeles, Salt Lake City, and other west-of-the-Mississippi locales. One key route has similar rates from American, Frontier, United, and others.

Delta's latest Europe sale features spring and summer travel to destinations such as Dublin, Frankfurt, Paris, and Rome. KLM and US Airways compete with Delta for your airfare business.

Fresh on the airfare market, Southwest's sale offers more than 1,200 routes to over 60 cities. Factor in all variables, including fees, before deciding if flying with the competition (American, Continental, Delta, United, US Airways, or Virgin America) is cheaper.

With Virgin America's latest offer fly to destinations on both coasts such Boston, Los Angeles, New York, and Orlando. Look to American, Frontier, JetBlue, United, and others for competing fares.