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PARIS (Reuters) - Qatar Airways has canceled orders for four A350-900 aircraft due to delays in deliveries and they will be “reallocated,” Airbus said on Thursday.

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.

“We confirm that Qatar Airways has canceled four of their contractual A350 delivery slots,” an Airbus spokesman said, adding the decision was related to “known supply chain issues”.

Asked what would happen to the undelivered jets, he said, “they will be reallocated”.

Airbus said it had won 248 gross orders between January and June, or 203 net orders after cancellations. It delivered 306 aircraft over the same period including 30 A350s.