Hawker (Raytheon) Horizon is listed in ICAO docs as HRZN but haven’t seen any tracks on one of these; however the NBAA demo a/c N15QS has recently been seen
as HA4T (Hawker 4000 - original marketing name). Is this an unofficial designator?
Also mentioned in the news forum a while back:
Are both ECL5 and EA50 correct?
Thx IN (UK)