The problem is from jplayer. Chrome 36 does not accept ' audio/mpeg; codecs="mp3" ' as exposed by jplayer because it is not RFC 3003. The fix is at the end of this thread: https://github.com/happyworm/jPlayer/issues/223
In Airtime you need to modify the /usr/share/airtime/public/js/jplayer/jquery.jplayer.min.js file.
Search for ==> codec: 'audio/mpeg; codecs="mp3"',
Then replace it to ==> codec: new Audio().canPlayType('audio/mpeg; codecs="mp3"') ? 'audio/mpeg; codecs="mp3"' : 'audio/mpeg',