SAER Demand Computation

SAER Arrival Demand Computation

SAER Arrival Demand is the number of aircraft that are ready to arrive at the airport. Flights that arrive within 15 minutes of the expected arrival time receive one unit of demand with in that 15-minute period. Flights that arrive more than 15 minutes late accumulate additional units of demand in subsequent 15-minute periods.

SAER Arrival Demand is derived in the following manner for each flight:   Start of Demand = Wheels-Off Time + Filed Enroute Time   (this is the time the flight should be at the arrival airport, i.e., wheels-on)   End of Demand = Wheels-On Time   (this is the time the flight actually arrived at the arrival airport)  

SAER Departure Demand Computation

SAER Departure Demand is the number of aircraft that are ready to depart from the airport. Flights that depart within 15 minutes of the expected departure time receive one unit of demand within that 15-minute period. Flights that leave more than 15 minutes late accumulate additional units of demand in subsequent 15-minute periods.

Start of Demand = Gate Out Time + Unimpeded Taxi-Out Time.

End of Demand = Wheels Off Time.

When an EDCT Delay is present, the duration of EDCT Delay is excluded from departure demand calculations, and added to the Arrival side. This adjustment is made because in the case of Ground Delay Programs with EDCTs, excess departure demand may be caused by capacity restrictions at the arrival airport.