Marlboro.
What about your ''Super Controller'' mates.The places they work,do they do 3 mile spacing.HK I know doesn't,Doha and Dubai well thats Middle East and they never used to.Enroute Aus highly unlikely,which leave SA,Denmark and Denver.Don't know.
However the vast majority of Nats approach unit has 3 mile radar separation.

You weren't a script writer for Pushing Tin at all.
Hey Uriah you may have The Marlboro to coax you gently into Serco sandpitland.Oh deep joy.

Every other thread seems to be about Middle East bitching about their packages.