Missing RAF serviceman's family: How can he vanish in digital age?

The family of an RAF serviceman missing for a month has made a fresh appeal for information about his disappearance. Corrie McKeague, 23, has not been seen since early on Saturday 24 September following a night out with friends in Bury St Edmunds, Suffolk. Speaking to Sky News, his uncle Tony Ringe said his disappearance was "so out of character" and there was "no evidence" he went missing "out of choice".