- Make the windows non-resizable.

- The PIREP constructor should get the flight object as its argument
   and not the GUI. Thus flight should expose other data as well, but
   not the GUI!

- Display the names of arrival airports when saying farewell at the
   end of the flight.

- A lamp-like icon for the connection status,

- Checklist editor: fix the problems with moving files when selecting
   not consecutive files.

- Check how piston engines report RPM

- Test:
   - Check how pitot heat works on the Dash-8: reversed, 0 means on, 1 means off