Flying economy from New York to London is one thing. Flying the same route on a private jet is another — and it's what the rich and famous are paying tens of thousands of dollars to do. Leading this luxury market is the Georgia-based private jet manufacturer Gulfstream and its ultra-luxe G700. Its cabin is larger than many New York City apartments. Billionaires like Elon Musk and Jeff Bezos bought a G700, while Homeland Security Secretary Kristi Noem reportedly spent $172 million on two for