The range is acceptable for the planes, I can only add them by adding a different plane that will show up on "add flights", and then changing the aircraft from the flight list. Even once I've gotten a few of them added this way, they still won't show up in add flights as an option. I've tried changing the filter to "all" or just the specific plane I want to add. They all have more than enough available hours.
Is this some sort of bug?