By Robert Wall 

LONDON--Emirates Airline is poised to pick Rolls-Royce Holdings PLC to power the airline's latest batch of Airbus Group NV A380 superjumbos, according to people familiar with the matter.

Emirates in November 2013 said it would buy 50 more A380 double-deckers, though it held off on making an engine decision. The Dubai-based airline, the world's largest by international traffic, has now opted for Rolls-Royce, said two of the people.

The deal for Rolls-Royce Trent 900 engines could have a list-price value of more than $2.5 billion, though large buyers typically get discounts. The airline could make its engine decision public as early as this week, one of the people said.

Emirates, the biggest operator of A380s, selected the GE, Pratt joint venture to power its first 90 A380 jets. The carrier had taken delivery of 59 of the jets at the end of March, according to Airbus data.

Airlines typically use one engine type per plane, though the size of the Emirates A380 fleet would allow it to use two versions economically, one of the people said.

Emirates and Rolls-Royce both declined to comment.

Rolls-Royce had secure more airline commitments for its A380 engine, though its rival sold more engines largely by winning Emirates as the customer, which is by far the biggest buyer of the plane.

The contract would make an important breakthrough for Rolls-Royce at Emirates, one of the premier buyers of long-haul planes. The London-based engine maker had no contracts with Emirates after the carrier last year cancelled a deal for Airbus A350 jets.

Emirates has been pushing to improve the Airbus A380 with new engines. Rolls-Royce officials have indicated they would consider building a new engine for the upgraded jet, referred to as the A380neo. Emirates President Tim Clark said he expected an A380neo with new Rolls-Royce engines to deliver double-digit-percentage efficiency gains.

Airbus said it is studying whether to proceed with such a program. The plane maker is trying to assess whether there is demand for such a plane beyond Emirates. Airbus said it would continue to improve the A380 even if that doesn't involve putting new engines on the plane.

Emirates said it could buy as many as 200 of the upgraded A380neo jets if Airbus were to build the model. The first of the regular A380 jets with Rolls-Royce engines is expected to be handed over late next year.

Write to Robert Wall at robert.wall@wsj.com

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