Motec CDL3 with absolute pressure sensor connected to it.
Start of file, Cape Town airport, Altitude 42m
End of file, Lanseria airport, altitude 1372m
Aviation laws state that pressurized cabins (passengers) may not be less than 75KpaA duting a flight, regardless of the altitude. Higher cabin pressures = more air frame stress. I think for this reason airlines will run it as close to 75KpaA as possible.
Maybe someone will find this interesting,,,