I think u find it in the MANUAL of FE on Side 6 in the Hangarreadme.
Here it is:
The Hangar Screen is your pre-flight area. From this area you can review the mission briefing, alter your aircraft’s
ordnance loadout, view and adjust your mission waypoints, and select a pilot for the mission. The main Hangar
Screen shows the mission briefing. Along with your squadron and aircraft information, it also displays the current
date (in game time). Planned takeoff, target arrival and landing times for the mission appear as well in 24-hour
military time.
The Hangar Screen contains five buttons, three of which activate subscreens.
Loadout
Takes you to the Loadout Screen where you can adjust weapon loadout for
your aircraft. You can also customize your aircraft’s appearance in the Loadout
area and, in some mission types, select the type of aircraft you want to fly.