FOV is applied everywhere, even where it normally shouldn't, like:
Shipyard screen
Planet info (F7) screen. You can actually change the FOV realtime with the effect of zooming the miniature planet in/out in that screen.
If there are backgrounds in the GUI screens, their FOV changes as well when in flight. Interesting effect, but probably not desired. Check what happens with BGS OXP installed.
If the player ship is set to be shown in the Commander Status screen, its FOV changes realtime when in flight.
FOV is applied everywhere, even where it normally shouldn't, like: