But Southwest is wildly popular and has had success adding longer routes.

Once it covers the United States, the company wants to start adding foreign routes.

Their plans are to add routes and have 8 or 10 planes by next year.

Several airlines are adding new domestic routes this summer.

The Seoul government banned the airline from adding international routes and flights for one year.

Two United States airlines are among those adding domestic routes this fall.

Three United States airlines have recently added international routes.

Despite this, the airline continued to add planes and routes to the fleet at a brisk pace.

Many airlines are adding routes and expanding service this winter.

American Airlines, which is adding overseas routes from the airport this year, will be the leading carrier.