Spirit Airlines plans to increase its capacity by 25 percent in 2012

Spirit Airlines has indicated that it wants to expand further. There will be more Spirit Airlines flights in 2012. The airline has revealed that it is planning to increase its capacity by 25 percent this year and has aircraft orders to roughly triple its size by 2021.

Travel experts recently said that Spirit Airlines is poised for further growth and is on its way to become the most profitable airline in the U.S. They said that Spirit Airlines, by conducting its affairs in its own way, is helping reshape budget air travel by charging for everything from boarding passes to drinking water. Ever since Spirit Airlines went public a year ago, its shares have nearly doubled.

Spirit Airlines started the practice of charging for all checked luggage in 2007 and became the first U.S. airline in decades to do so. The business model of Spirit Airlines was later on copied by most other major U.S. carriers.

Spirit Airlines is currently bringing in nearly a third of its revenue for baggage and other services, compared with the industry average of 6 percent.