You need to pay always for your apps and sometime you get free apps and why not you earn some bucks through your apps. Yes it is possible through Delta and AA, they are offering a chance to win one million frequent flyer miles by using iPhone Apps.
You have the chance to beat the George Clooney character’s miles accumulation in Up in the Air. However, these App Store promotions are only for members of both Delta’s SkyMiles and American Airlines.
If you are not a member at present, why not register yourself today and try your luck. One Millions is huge money and there is no harm in trying.