You should be using $this->get->reg
Also, you don't need static, you can just call it using $this->getAircraftInfo(). Though you should call the API OperationsData::getAircraftInfo()
If it's not in local.config.php, it just uses the values in app.config.php. Local.config isn't touched by the installer, so any new settings I add don't automatically get added into the local. In this case, those settings I've added in betas