LONDON (AP) — A British man on Friday won a High Court challenge of his conviction for tweeting that he would blow up an airport if his flight was canceled, a ruling that had made him an Internet free speech cause celebre.

Paul Chambers, 28, was convicted and fined 385 pounds ($605) in 2010 over the tweet that he would blow up Robin Hood Airport in northern England, which he insisted was a joke. Thousands of Twitter supporters retweeted Chambers’ message after he was convicted with the tag “I Am Spartacus” — a reference to the 1960 movie epic in which the titular hero’s fellow rebels all assume his identity in a gesture of solidarity.