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   National Airspace System Status (nasstatus.faa.gov)
Use this all the time for flying, it's fantastic. Great to know you'll be delayed before they even make the decision.

Highly recommend the 'Map View' tab and the 'Weather' tab (especially with Cities + Fronts enabled).

FlightAware's MiseryMap is pretty cool too https://www.flightaware.com/miserymap/