FAA's new Web-based registration system for hobbyists and recreational users who fly small unmanned aircraft systems (UAS), which include remote controlled aircraft, is active. Owners are required to register any UAS weighing >0.55 lb and <55 lb if they are to be flown outdoors for hobby or recreation. Aircraft operated by current owner before December 21, 2015 must be registered no later than February 19, 2016. For any others, registration is required prior to first outdoor flight.