We have a script that runs on a really old software package to do our flight planning. It is a script written by one of the computer geeks long ago. It is not real fancy and it will let you enter any values by mistake and then build the flight plan. The procedure we figured out long ago was to open the flight computer laptop and see if the flight makes sense. We suspect something was slight wrong when the field elevation was 1,500 feet but the flight altitude was 800 feet below ground. For some reason the pilot has a problem with that. He was afraid he might get rather dirty.
We can bang out a flight program in short order using the old setup simply because it is familiar. New flight planning software is breath taking in price, like over 20 grand.