Also known as: hy.
HY has various meanings in the Governmental & Military category. Discover the full forms, definitions, and usage contexts of HY in Governmental & Military.
Used, with certain exceptions, during all radio transmissions between air traffic control and any aircraft which has been assigned a maximum takeoff weight (MTOW) rating of 136 tonnes (300,000 lb) or more.
Governmental & MilitaryLast updated: