Assertion: aircraft's position | /r/HasProperty | important
Facets:
value: to prevent taxiway and apron gridlock
type: PURPOSE
value: particularly
type: DEGREE
value: at heavily congested airports
type: LOCATION
Source sentences:
text: At some airports, clearance delivery also plans aircraft push-backs and engine starts, in which case it is known as the Ground Movement Planner (GMP): this position is particularly important at heavily congested airports to prevent taxiway and apron gridlock.