The best Citation Business Jets in the industry are available
from the Cessna company. You can get more information about the
Cessna company and their jets at the Cessna website.
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There is no difference. Delta just calls their business class
Business Elite. Just like Nwa calls theirs World Business
Class.
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I would say only if they can afford to. If the business is a
major corporation, then certainly. If the business is small and
leasing private jets, there could be some corruption going on
behind the scenes.