I help billionaires buy private jets. Sometimes I tell them not to.

As the head of aviation finance at Citi, Mike Francis advises clients on purchasing private jets. Courtesy of Citi Mike Francis is the head of aviation finance at Citi. He advises wealthy clients on purchasing private jets, including when to hold off. Here is what today's private jet owners are looking for. Skip the theater system, throw in a Peloton, and make sure there's a private space for Zooms. Mike Francis, the head of aircraft finance at Citi, said a new wave of private jet owners is fueling demand for new amenities. Before he'll even talk about add-ons like those, Francis has a word of warning. If a private jet costs more than 10% of your net worth, think twice. At the low end, that translates to a net worth of $30 million. At the high end, closer to $1 billion.