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Flightradar24 provided a light green representation of the unidentified pilot's flight, displaying his message online.
He took 37 minutes to complete the complex flight pattern over Germany's Niedersachsen region.
The pilot has created various other aerial works of art including a large flower pattern.
👋 Hello. https://t.co/UB3wyExVpM pic.twitter.com/drp2NOK6z5
— Flightradar24 (@flightradar24) November 29, 2016