In the late 1980s the corridors were ten miles wide.I remember trying to get around weather on the way to HLZ and the US controller saying "you are 9.8nm right of the centerline what are your intentions?"Very long pause whilst we went around cb and then said "coming left back onto track."Going outside the corridor involved declaring an emergency.The PanAm crews used to ask for a shortcut at the western end of the central corridor .It was called the ??? transition and was named after the guy who invented it.
Certainly fun days