PRIVATE AIR TRAVEL may be one of the best perks of wealth. No long security lines, no crowds, no delays, missed connections or cramped seats with zero legroom. Owning your own plane is an option, as is fractional jet ownership, where you buy a $350,000-$500,000 share in a plane (think timeshare), pay regular maintenance fees and pay for every hour of a flight. But the wealthy in Sarasota can also commission a jet without any sort of ownership if they use Sentry Jet, which opened an office in Sarasota last April.