Plain English Meaning

IR1206 is the name of a particular military training route. The 'IR' part means military aircraft fly it using their instruments, and the number tells you it's a route where some sections are flown higher than 1,500 feet above the ground.

Full Definition

An example designator for a specific Military Training Route (MTR) flown under Instrument Flight Rules (IFR). The 'IR' prefix indicates the route is operated under IFR, and the four-digit number '1206' identifies the specific route. Four-digit MTR numbers (1206) indicate that one or more segments of the route include operations above 1,500 feet AGL. Three-digit MTR numbers indicate the entire route is at or below 1,500 feet AGL.

Context Anchor

Seen on aeronautical charts and in discussions of Military Training Routes in the Pilot’s Handbook of Aeronautical Knowledge.