Charlie or Charlie Charlie is still very widely used out here in africa VHF and HF and probably stems from the nautical code of signals as one ppruner has pointed out...I'm consciously trying not to adopt it so that when back in europe I don't upset you nice people....... ( CQ by the way does not strictly mean hello....it's used when calling unknown operators on freq. 'any station' hence 'seek you: CQ'. I still use it when sailing and needing a radio check. I also still catch it when listening to morse traffic from time to time...it has a pleasant rythm...
dah dit dah dit...dah dah dit dah....

Do they still use morse to coordinate between different sectors at LATCC?? :p

Sure do Mister Geezer. Problem is that the kids can only manage 30wpm and I used to fall asleep!