AirTran Airways and online travel company Expedia Inc. have signed a four-year partnership agreement in which AirTran's full range of products and services, including fares and schedules, will be marketed through Expedia.com.

The financial terms of the deal were not disclosed.

The discount airline is the second-busiest airline at Baltimore/Washington International Thurgood Marshall Airport. It controls 10 percent of fast-growing BWI's market share, behind industry giant Southwest Airlines Co. (NYSE: LUV), which makes up half of the airport's business.

The agreement allows AirTran to take advantage of Expedia's broad reach and targeted merchandising opportunities, while giving Expedia customers greater access to AirTran's low-fare air travel services.

AirTran Airways, a subsidiary of Orlando, Fla.-based AirTran Holdings Inc., operates nearly 700 daily flights to 52 destinations and employs about 8,000 people.