vref speeds vs field elevation
Previously I flew the 777, and remember that altitude affected the vref... for example at a given weight and sea level vapp would be 140 Kias.....then the same airplane landing in Johannesburg or Quito(7-8000 feet) would have approach speeds in the 120s.
Currently I fly the 75/76 and vapp seems to be the same at sea level or an 8000 foot airport. Just trying to understand how or why?