WillowRun
the first in which ACARS datalink transmissions to and from satellites are used to determine ... an airliner's flight path and location? My understanding is that the BEA looked at ACARS indications of inconsistencies in airspeed in AF447 but not with respect to flight path or ultimate location.
AF447 transmitted Acars - including position - to the satellite, MH370 didn't, its Acars were VHF only and that function was disabled. It's probably the first time possible positions have been calculated using the timings of the handshake - which were for the satellite telephone only.