The path of aircraft traffic around an airfield, at an established height and direction. At tower-controlled fields, air traffic controllers supervise the pattern by radio (or in non-radio or emergency conditions by red and green light signals
EESiFlo North America, Terminology and Glossary: Aviation Terms General Aviation, Pennsylvania, USA 2002. flowmeterdirectory.com/flowmeter_terminology, (Avn - Amer) {550}