NEW DELHI: Aviation expert V Krishnan passed away in the wee hours of Thursday after suffering a heart attack a couple of days ago. Well into the 80s -Krishnan has been a long crusader for the Air Traffic Control-related issues - a job in which he excelled and continued to contribute even after his retirement. With expert comments in media on aviation matters, he was amongst the few who got his way when he wanted and was not afraid of being quoted.