For more than two years, there's been speculation about who is lining up for the Gulfstream G650, the new private jet that has quickly become one of the most impressive aircraft in the skies today. In 2011, the New York Post reported Oprah Winfrey, Warren Buffet, and Ralph Lauren were all lining up to drop $65 million on the jet. But for those who are just looking to get on the list now, the next available plane won't be delivered until 2017 — and there's no way to jump the line, Gulfstream says. "You are not allowed to sell your...