Delay Propagation: FAQ
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Can I compute the number of minutes of propagation in the NAS for a given time period?
It is possible to derive the total minutes of propagated delay (based on the subset of flights that meet the three criteria for propagation outlined in Delay Propagation: Overview) by selecting no arrival and no departure airport for a given time period and then by running the ‘Summary Report’.
What is the difference between arrival and final arrival?
In a multi-stage trip, propagation can be computed from the departure to intermediate arrivals in a series of stages, or to the final stage of the trip.
What does the multiplier mean and why is it important?
The multiplier measures how arrival delays grow in the subsequent stages of a flight. Propagation may grow faster or contract as flights go through specific airports. The multiplier measures the amplifying effect of some airports and how much they contribute to the growth of propagated delays.
What is the accelerator and why is it important in the propagation analysis?
The accelerator measures the incremental change in the delay propagation from one stage to another. It enables analysts to pinpoint where propagation is more likely to increase and how fast it has increased from one stage to another.
