You might not be able to learn how to fly a multi-million dollar airliner while playing the latest Microsoft game, but airlines regularly train their pilots to fly in simulators before they let them loose on the controls of the real thing. They also use them to ensure that their pilots can familiarize themselves with any software or hardware upgrades that their air fleets might be utilizing and to help them qualify to fly different makes and models of airliner. Flight simulators are an invaluable resource for pilots and an excellent way to help them train to fly and to maintain their already established skillset.