Ground stop


A ground stop is an air traffic control measure that slows or halts the flow of aircraft inbound to a given airport. In other words, a ground stop is the halting of departing aircraft destined for one particular airport or for a specific geographic area.
For example, if a ground stop is called for Newark Liberty International Airport, aircraft departing for Newark from other airports will not depart until such time that the ground stop in Newark is lifted. This allows, in this example, for Newark to deal with the task at hand preparing for arriving aircraft once the ground stop is lifted.
Ground stops may occur during an operational event, a thunderstorm, due to the danger of wind shear, hail, or another weather-related hazard.
A ground stop does not affect flights en route, but it is often accompanied by orders to divert to other cities.
Flights that have not departed their airport of origin will be delayed or cancelled. Airlines are required to manage their aircraft at all airports to minimize the impact to passengers affected by the ground stop.

Notable examples

On September 11, 2001, the U.S. FAA issued a ground stop order for the entire United States, as a precaution against possible additional incoming terrorist attacks by plane. In addition to grounding international flights which had not yet departed, flights already in the air were either re-called or diverted to airports in other countries, mostly Canada. The ground stop was lifted on September 13, when departures from airports within the US also resumed.
In January 2014, Nav Canada issued a ground stop for Toronto Pearson due to cold weather. The airport authority said the extreme cold was causing "equipment freezing and safety issues for employees."
On January 25th 2019, the FAA declared a ground stop at New York's LaGuardia Airport over a staffing shortage caused by the government shutdown.