Ah, the sharing economy. You can share rides to the office. You can shareapartments. You can even share boats. What you can’t share, though, is your airplane, should you be lucky enough to own one. TechCrunch reports that, per an FAA ruling released today, the new rules prohibit pilots “from publicly offering seats on their planes in exchange for gas money.” This will affect startups like Flytenow and Airpooler. The FAA addressed its statement to Airpooler, which requested legal clarification from the agency last month on whether it is running a legitimate business.