Although it was a couple of years before I first served on 72, it was still much talked about.
IIRC, clearance was obtained (from whom I know not?) to fly at 140 kts rather than the normal VNE of 120, subject to a reduced MAUM (MAUW in them days) and adjusted NR.
Now: would the NR be
increased to delay the onset of RBS, or
decreased to delay the onset of compressibility effects on the advancing tip.
