[Guest]

Davidson, i think yes, it may take a bit of time, but it would be better if you added all the new planes one at a time, testing between each one. That'll be the safest way to identify the culprit.
Your air.ini looks okay, but do it this way, anyway. Remember, the error could also be an incorrect/missing entry in the plane_ru or weapons_ru.properties files, sitting in MODS\STD\i18n.
BTW, what new AC have you installed recently?