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Much like an individuals personal finances, the more you own, the better of you are financially. That's why the airlines that own their fleets tend to do better than the ones that lease (ahem...).
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I would beg to differ - with the tax advantage of leasing, and the rapid depreciate schedule you can use, it is easy to see why many airlines lease to purchase.
Leased aircraft are very unlikely to sit in the desert - leasing is a non cancellable agreement, if they are sitting in the desert they still have to pay for them.
I theink IFLC (or something like that) is the big aircraft leasing company, but I know JP Morgan Chase has a division, as I am sure do many companies.
It might also be of interest - that the leases are generally airframe only, I once heard most engines were owned by japanese banks.