The Air France plane disappearance features on the front of the Express as fears grew for a number of missing Britons. Full story >>
If someone or something vanishes into thin air, they disappear suddenly or in a way that cannot be explained, leaving no trace. • After several barmaids, girl friends and two of his wives vanished into thin air, the local authorities began to suspect Ball. In the Express headline, there's a play on the word "air"—the Air France airplane was in the air when it vanished. The Phrase Finder has an article on the origin of this expression.