There is no general altitude limit in the U.S., but you must not present a risk of collision with manned aircraft. Certain areas have additional restrictions (e

There is no general altitude limit in the U.S., but you must not present a risk of collision with manned aircraft. Certain areas have additional restrictions (e.g. near airports, large sporting events or in the vicinity of Washington, DC). The "400 ft" limit for model aircraft is purely advisory and is not part of any binding FAA rule. Additional discussion here: http://amablog.modelaircraft.org/amagov/2012/03/08/your-questions-answered-the-400-foot-limit-for-model-aircraft/ http://amablog.modelaircraft.org/amagov/2012/03/08/your-ques...