This example shows an aircraft flight path over a map of Wellington, New Zealand, rendered as a blue polyline on an OpenStreetMap tile layer. It uses the Leaflet JavaScript library to create the map, center it on the coordinates, and add the tile layer from OpenStreetMap. The flight path data consists of repeated latitude and longitude coordinates stored in the `planelatlong.js` file, which is loaded and passed to `L.polyline` to draw the route on the map.