Custom ammo offline ?

[FZG_Immel]

find my own answer in an other thread :

In the PLANE section of the options think of it like a menu tree,

on the first screen is where you save the complete package of your plane, skin, weapon load, belt load out.

so you go in set your skin on the plane go into loadout and set up your belt preference or load a belt you have saved previously then go back to the plane screen where you change the skin and so on and save there, then when you go into a quick mission and underneath the plane you have chosen where it says "default stock" change to the save you made on the plane screen and this will apply your skin, gun set up, and belts to your plane for that mission

hope that explains it

if you save in the belt screen you have only saved a belt arrangement not the full plane setup required for use in quick missions