in today's "fiscal climate" if the asset, in this case an airplane, does not clearly facilitate business operations / close deals / etc , or directly earn money for the company (shareholders), kiss it goodbye. Just ask the Big-3 auto executives how that little deal worked out.
(Unless you fly for Rich Guy who owns a plane as basically a toy, and you are his pilot. But I would argue that is not in the truest sense of the word a "corporate flight department" it is "I fly for a rich guy").