AIR GO is an app vulnerability scanning service for finding vulnerabilities in Android or iOS app package files (apk or ipa). AIR GO is somewhat similar to SandDroid, an open source project. Recently, LINE has been using AIR GO to check LINE apps for vulnerabilities before they are released, to provide secure services to LINE users. Anyone can access AIR GO simply by registering their email address. Actually, AIR GO had been introduced on the LINE website previously; today, I’d like to discuss about it in more of a developer’s point of view.