Ground stop at JFK due to staffing

What does this actually mean? All flights around JFK are cancelled until further notice? Can someone translate? Does this affect EWR and LGA?

Any flights that are to depart for JFK but are still on the ground must stay put until the expiration or cancellation of the stop. No, it doesn’t impact other airports.

Flights are delayed, however since planes are choreographed by airlines for maximum utilization, long enough delays and you will see mass cancellations, potentially across large swaths of the country.

i.e. a plane for one route might go between various different cities in 24 hours, with different crew each time of course before it gets back to the first route.

Any disruption at one major airport affects pretty much all the airports, if it lasts long enough. Those grounded planes will soon be expected elsewhere.

Agreed - but they’re not directly impacted by this ground stop.