[lstodd]

Like how you are going to maintain your 737 or 320 rating flying a Cessna?

Besides, I suppose keeping a plane in storage and serviced while keeping your workforce certified and ready isn't that much cheaper than keeping all them somewhat flying.

[jpgvm]

If you mothball a plane for 2 years it requires a huge amount of work before it's qualified to fly again. Probably not higher cost than the total work of maintaining it in flying condition for those 2 years but the man-hours are a lot easier to manage when amortized over that period vs all at once.