GerardC,
From Annexe 1 of the first interim BEA report.
Dans la nuit du 31 mai au 1er juin, un avion équipé du système AMDAR a suivi une route semble-t-il similaire à celle du vol AF447, passant au voisinage du même amas orageux, environ 30 minutes plus tôt, au niveau de vol FL325. Cet appareil a transmis uniquement des mesures de vent et température.
[^^^ p. 91]
The flight is identified as EU0046, flying at 10660 meters, FL325, outside air temperature -40.6C, in light winds. and those measurements were recorded at 01h44.
Back in thread one, the conclusion among posters was that EU0046 was the Lufthansa, and its true identity had been withheld for proprietary reasons. The 30 minutes more or less is actually closer to 20 minutes, as the 01h44 time for the data point would indicate. AMDAR was taking a measurement every 7 or 8 minutes, and I believe the 01h44 point was the one nearest AF447's 02h10 position.