In a few countries such as the UK, gliders may continue to climb into the clouds in uncontrolled airspace, but in many European countries the pilot must stop climbing before reaching the cloud base (see Visual Flight Rules).
在少数国家，例如英国，在非管制空域内允许滑翔机爬升进入云层，但很多欧洲国家禁止飞行员驾驶滑翔机超过云底高度（目视飞行规则）。