Very unlikely that biz jet use will expand in days to come which is one theme of this thread. Much more likely, the polluting over-use of close-in airports by private jets will be cut way back.

IMHO, it is unlikely that we will have much of an air travel system if oil prices stay anywhere close to the present level. The airlines cannot survive at these prices--and, probably, neither can private jets, once folks understand their fuel inefficiency.

Driving a Hummer will soon (if it doesn't already) subject you to so much ridicule that you won't do it. Private jets are likely to go the same way.