Qatar Airways has axed orders for four A350s because of delivery delays, Airbus said on Thursday, handing the European planemaker a new headache over what to do with jets worth $1.2 billion at list prices as it tries to close a sales gap with rival Boeing.

Confirmation of the move, which leaves Airbus with four completed A350s worth $311 million each at list prices looking for a new home, came with monthly data showing a tripling of year-to-date orders following last month’s Paris Airshow.