Buffet boundaries
Four hours into a Rio-Paris flight, AF447 was cruising normally at FL350. The crew noted from their flight data that they were still too heavy to climb to the next appropriate higher cruise FL.
But moments later AF447 'zoomed' – for whatever reason – up to FL380.
So having unintentionally arrived at FL380 at a heavier than planned weight, what were the new 1g stall (low speed) and Mach buffet (high speed) IAS boundaries for AF447?