Southwest agreed to buy AirTran in a $1.4 billion deal that will combine two of the country’s largest low-fare airlines and give Southwest a bigger slice of the market in the Northeast and in Atlanta, at the world’s busiest airport. A look at the major U.S. airline carriers:

UNITED-CONTINENTAL

• Headquarters: Chicago

• Employees: 87,529

• Destinations served: 371

• Fleet: 1,236

• Alliance: Star Alliance

• Daily departures: 5,800

• '09 Revenue: $28.9 billion

• Key U.S. hubs: Houston, Chicago, Newark, Denver, Los Angeles, Washington Dulles, Cleveland

DELTA

• Headquarters: Atlanta

• Employees: 81,916

• Destinations served: 369

• Fleet: 958

• Alliance: Sky Team

• Daily departures: 5,715

• '09 Revenue: $28.1 billion

• Key U.S. hubs: Atlanta, Detroit, Minneapolis, New York

SOUTHWEST-AIRTRAN

• Headquarters: Dallas

• Employees: 42,719

• Destinations served: 106

• Fleet: 682

• Alliance: --

• Daily departures: 3,886

• '09 Revenue: $13.4 billion

• Key U.S. hubs: Chicago, Las Vegas, Atlanta, Phoenix

AMERICAN

• Headquarters: Fort Worth

• Employees: 86,451

• Destinations served: 250

• Fleet: 885

• Alliance: OneWorld

• Daily departures: 3,886

• '09 Revenue: $19.2 billion

• Key U.S. hubs: Dallas, Chicago, Miami, Los Angeles, New York

US AIRWAYS

• Headquarters: Tempe, Ariz.

• Employees: 31,367

• Destinations served: 200 plus

• Fleet: 627

• Alliance: Star Alliance

• Daily departures: 1,216

• '09 Revenue: $10.5 billion

• Key U.S. hubs: Charlotte, Philadelphia, Phoenix, Washington-Dulles, Cleveland

JETBLUE

• Headquarters: New York

• Employees: 12,000

• Destinations served: 61

• Fleet: 153

• Alliance: --

• Daily departures: 650

• '09 Revenue: $3.3 billion

• Key U.S. hubs: New York, Boston, Fort Lauderdale, Los Angeles/ Long Beach

Source: Company filings, Associated Press

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