Airbus says it was an A310-300 first delivered in 1990 and had been in service with Yemenia since October 1999. Mfr's serial number was 535 and registered as 70-ADJ.
It had 51,900 flight hours spread across 17,300 flights.
The first A310-300 entered service in December 1985. As at May 31, 2009, 41 airlines operate a total of 214 A310s. The total A310 fleet has logged 11.7 million flight hours during 4.5 million flights.
Link: Crash au large des Comores: l'Airbus A310-300 était en service à la Yemenia Air depuis octobre 1999 - Yahoo! Actualités (in French)