Export shape file of flight area

Is there anyway (plugin etc) that will allow me to export the boundaries of a flight plan? I know I can create shape files and import them but this is not totally helpful since I tweak the boundaries based on flight time etc and my initial shape in no longer valid.

thanks in advance

Hm. It’s a few steps, but if you create a map, you could then export it as a Web Mercator projection GeoTIFF, which will give you a KML. You can then import the KML just as you would a shapefile.