How common is it for helicopters to fly at 41,000 feet? I see N924PH on my receiver and also on flightradar24. Also, 474 knots seems very fast for a helicopter. Is this aircraft being misidentified maybe? Peak speed on the flightradar24 path seems to be 623 knots. FR identifies it as a Sikorsky 92A, which wikipedia says has a cruising speed of 174 knots.
I just checked the json aircraft file on my receiver, and it was identified from the ICAO hex code “acce53”