Drone use by companies and individuals is accelerating so quickly that the Federal Aviation Administration and Congress are struggling to keep up. But it’s vital that they try. The FAA, which started registering unmanned aircraft nine months ago, has already registered 550,000. It’s adding 2,000 new registrations a day. Increased use by both businesses and hobbyists obligates the FAA and Congress to adapt quickly to new realities in the sky and nimbly adjust new regulations. It’s better for public safety and all involved — from agribusiness users flying over corn and soybean fields to hobbyists racing drones at a park — if the feds remain flexible and attentive.