Where Are They Flying To is a heatmap showing the destinations of flights that fly over my house. The data is collected by receiving and processing ADSB broadcasts from aircraft and uploading them to this site each hour. You can zoom around the map and filter out flights above or below certain altitudes using the controls on the map.
To find out how the data is collected and this map produced, please visit https://github.com/andrewl/wherearetheyflyingto