West Palm Beach, Fla.-based Greenjets said its shared-ride charter jet membership service has been growing quickly since it was launched a year ago. “Our business has been doubling or tripling every month,” company president Dean Rotchin told AIN. Greenjets offers a “more environmentally, socially and fiscally responsible” way to use private jets by allowing customers to book seats and share charter jets, thereby reducing the per-passenger carbon footprint in addition to lowering travel costs. The company uses only aircraft operated by Argus Platinum- or Gold-rated charter operators. One-year memberships start at about $2,000 and fixed per-seat costs for a one-way New York to Florida charter flight start at $2,400 with a Black card membership. Gold and Black card members can also bring a companion on booked flights for no charge. Greenjets currently serves the New York-Florida and Chicago-Boston markets, and will soon start New York-Los Angeles flights. It plans to be in 30 markets–including Atlanta; Washington, D.C.; Dallas; Houston; Las Vegas; and Phoenix–by the middle of next year. Customers are also permitted to go outside the current route structure and share aircraft with other members via Greenjet’s private social networking site.