Boeing’s 787 Dreamliner is overweight and experiencing delays with some suppliers, the company said Sunday, while stressing that the long-range, fuel-efficient jet remains on budget and on schedule.

Rival Airbus, however, announced this weekend that the widely expected redesign of its planned A350 – billed as a competitor to the 787 – will nearly double the development cost of the plane.

Boeing Commercial Airplanes Chief Executive Alan Mulally, speaking in London on the eve of the Farnborough Air Show, declined to say where 787 supply problems were occurring or by how much the plane was exceeding its target weight.

“We’re a little over where we want to be at this time on weight, but ahead of where we were on previous programs, so we’re really focused on weight-efficient structure right now,” he said.

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