Definitions Found:
planes circling an airport waiting to land
- stackupplanes circling an airport waiting to land
- stackupsSTACKUP, planes circling an airport waiting to land
- stackupgroup of airplanes circling over an airport awaiting their turns to land
- stackto control the flight patterns of airplanes waiting to land at an airport so that each circles at a designated altitude
- clearancesPermission for an aircraft to take off or land at an airport
- clearancePermission for an aircraft to take off or land at an airport
- thresholdsThe beginning of an airport runway on which an aircraft is attempting to land