Even if low-cost airlines expand as United struggles, however, they may run into problems.

In the past, the airline expanded by buying bigger planes.

Much is riding on whether the airline can expand within Africa.

The move was to help the airline expand its operations network.

Several airlines, intent on grabbing market share, are expanding despite losses.

The airline expanded to 4 flights per week in March 2006.

During the late 1990's, when the economy was vibrant and growing, the airlines expanded rapidly.

"Any time the airline expands, you get the same thing," he said.

Meanwhile, airlines like United and American have expanded their international service.

The airline later expanded into offshore oil support flights from July 1965.