Neat plots, but I find the real-time and historic plots of actual GPS tracks shown at
Flightradar24 much more fascinating. Most European flights have an
ADS-B transponder on board, which basically is a radio beacon that transmits a GPS position. These signals can be received by anyone with a cheap
USB receiver over a few 100 km. For these planes, the position is plotted online with a delay of only 10 seconds or so. American planes seem to lagging behind with adoption of this system. I can watch this site for hours to see what airplane flies over my house, to see how airplane are holding in case of bad weather, to see when I have to pick up friends from the airport,
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