Modify aircraft to use certain weapons?

[masonlee]

Hi,

 

How can i modify an aircraft so that it can carry and use certain weapons?

For example, i found that my F-35 model just able to use AIM-9 missile for air to air fighting, how can i make it able to carry AIM-120 AMRAAM as well? The AIM-120 missile is not available for selection in the weapons list. My other aircraft like F-18 is able to use AIM-120 AMRAAM.

 

Thanks