Ground delay programs & EDCTs, explained

A ground delay program (GDP) is the FAA metering arrivals into an airport that can't land its full schedule: think of it as a reservation system for runway time. Instead of halting traffic like a ground stop, the FAA assigns each inbound flight a new wheels-up time so aircraft absorb the delay at the gate, not in a hold.

EDCT: your new departure time

Inside a GDP, each affected flight gets an EDCT(Expect Departure Clearance Time, "the wheels-up time"): a ±5-minute window it's expected to actually lift off in. Miss it and the flight goes back into the queue for a new slot, which is why crews board on schedule even when a two-hour delay is posted: the EDCT can move up when the weather improves, and an aircraft that isn't ready loses the improvement.

Why GDPs happen

• Reduced arrival rate: low ceilings or visibility force instrument spacing; a 60/hour airport becomes a 40/hour airport, and the surplus must wait somewhere cheap: the origin gate.
• Sustained weather: the multi-hour version of the problem a short ground stop can't absorb.
• Runway closures, construction, staffing: anything that trims capacity for hours.

Reading the numbers

A GDP publishes an average delayand often a maximum. Averages hide spread. Some flights eat far more, and early-morning departures often escape entirely. The trend matters more than the snapshot: an average that's falling means the program is being revised toward normal; rising means the weather is winning. GA pilots aren't usually assigned EDCTs at the origin, but flying into a GDP airport still means flow times, holds, or a smarter plan to a reliever field.

⚠️ Informational only. FAA NAS Status is the authoritative source. Airline passengers: your carrier's updates govern your flight.