Japan Airlines <9201.T> earlier announced an order for 31 Airbus A350s including 13 of the largest variant, the 365-seat A350-1000 model, buying aircraft from the European manufacturer for the first time.
Shortly afterwards, Leahy told an industry conference: "We have an internal target of 1,200 (orders) but I think we could even do a little better than that," although he said no new formal target had been set.
Airbus posted 1,112 orders between January and September.
Airbus and
Lufthansa
The size gap has led to speculation that Airbus could increase the size of the already stretched A350-1000 again to add more seats.
Airbus has so far ruled this out and Leahy said there were no plans to do this any time soon, although he did confirm for the first time in public that Airbus had considered the option.
(Reporting by Tim Hepher; Editing by Kevin Liffey)