Intercepted one in the mid-70's somewhere between Shetland and Faroe Islands. Interestingly, they filed a complaint. Interesting since the only way they might have known we were there is by 'hearing' our radar (We stayed out of sight until shadowing line astern) or by data from other assets.
Claims of air piracy had little effect on my career which, by then, was proceeding downhill, out of control and at ever increasing velocity.