As you might expect, AA, Boeing and RR have all responded quickly to this reported incident involving an AA B777.

Without going into specific details, because they have been provided in confidence, preliminary indications are that this AA incident - whilst obviously of great concern - is not currently thought to be similar in nature to the recent BA B777 accident involving G-YMMM.

Preliminary indications tentatively suggest that the AA aircraft suffered some form of autothrottle malfunction, apparently confined to the left engine, but that both engines always produced their commanded thrust levels.