@Cazalet33
Looking up French warship 9104 I see her described by Wiki:
Tonnerre (L9014; lit. Thunder) is an amphibious assault helicopter carrier of the Marine Nationale.
Helicopter Carrier
Tonnerre was not dispatched for supporting this operation. So this tag "9104" is more likely given to PHM
Jacoubet which is, since May 23, only doing surface sweep and visual researches for debris and they deployed two aircraft, a Falcon 50 and Atlantic 2, in addition to Egyptian and US assets deployed.
See official French Navy media, 28 May situation :
Vol Egyptair : Point de situation au 28 mai | colsbleus.fr : le magazine de la Marine Nationale
Hydro Vessel
Laplace would be on spot by tomorrow with pinger locators. Search for beacon will start then. Next, in about a dozen days, they would be joined by Deep Ocean Search R/V
John Lethbridge (sailing from Ireland sea) for the deep sea recovery mission.
Deep Ocean Search - Home