Flight delays application overhaul

In Flight delay information for United
flights
,
I talked about an application I wrote to show United flight delays over
time. I have now completely rewritten that application to allow
comparison of multiple flights on one graph.

People that travel for a living know that early morning flights tend to
be less delayed than evening flights. In the morning, the planes are
usually already at the airport, so there is no chance of an incoming
flight delay. There are no lines of planes waiting to take off yet, so
the time between leaving the gate and getting into the air tends to be a
lot less.

The difference in these times can be dramatic. Here is a report
comparing an early morning flight with an evening flight from Newark to
Chicago (two heavily delayed airports): Flight
Delays

The report shows a table of min, max, and median delays:

Flight Min Delay Median Delay Max Delay


Flight 655 (EWR -> ORD) on Thursday at 07:38 PM -14 40 239
Flight 635 (EWR -> ORD) on Thursday at 05:58 AM -26 0 157



And here are the two graphs shown in the report above:


As you can see from the first graph, day by day, flight 655 (departing
around 7:38 PM) is almost always more delayed than flight 635 (departing
around 5:58 AM).

The second graph shows a histogram. You can see that flight 635 is
clustered more heavily to the left (-40 to 20) which shows that it is
generally between 40 minutes early and 20 minutes late. Flight 655 is
much more spread out to the right, which shows that it has far more
delays. On one day, it was over 220 minutes late!

Paul Gross

Paul Gross

I'm a lead software developer in Seattle working for Braintree Payments.

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