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FAA requires all drones above 250g to be registered. It is an online process and all you get is an FA # that needs to be on your drone....
Any UAS of ANY weight that is flown for non-hobby flights requires Commercial Reg # regardless of weight.
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If you are 107 certified then any drone used for commercial flights (you get paid) will need a unique FA #.
Let's be a bit more specific..
Part 107 encompasses more than "just" getting paid. If any portion of the flight does not fit totally within the Hobby/Recreation box then Part 107 is required. Even Volunteer work requires Part 107 and we aren't getting paid.
Also it needs a Commercial Registration # (which is unique to each aircraft) as to not be confusing.
If you started out recreationally with 1 drone and you become 107 certified that drone FA # is good. If you used it for 2 or more, then the drone or drones you will use to make money need unique FA #.
If you start out with a
Recreational # and later decide to use that aircraft for Commercial Operations you need to
REMOVE the
Recreation Reg # and get a
Commercial Reg # and apply it to the aircraft. We can not have more than ONE registration # on an aircraft.
On the good side... an aircraft that is registered as Commercial Reg can be flown for Commercial or Hobby/Recreational flights. But an aircraft registered for Hobby/Recreational can ONLY be flown that way and NOT Commercial.