This is a problem! Any idea how your flight plans are getting erased? It is possible to reload your flight plan during a flight. Pause the flight and from the Pause Menu, selsect “Load”. A window will open that limits the files to .flt flight files. Type in . for the file name and press enter. The window list will open with all files. Select the flight plan (.pln) to load. Then press enter to have it reloaded.