Robert Wall

LONDON--The departing chief executive officer of Rolls-Royce Holdings PLC Friday said United Technologies Corp. is an "obvious" potential partner for the British engine maker as it eyes a re-entry into the huge market to power single-aisle jetliners.

Rolls-Royce was teamed with Pratt & Whitney, the engine arm of United Technologies, on making engines for Airbus A320 jets before exiting that partnership in 2011.

"We know we can work well together and I think we could work well together in the future. It is certainly a possibility," John Rishton told reporters after the company's annual shareholder meeting.

Narrowbody jetliners such as the Boeing 737 and Airbus A320 represent the bulk of commercial flying and around 75% of all airliner engines by volume. The size of the market is driving Rolls-Royce's interest to re-enter because of differences with its partners over engine development trends at the time and business priorities.

Mr. Rishton said the company has the technical skills to develop a new narrowbody engine on its own, but that market dynamics make teaming up with another company prudent. "The issue that I am troubled by is the incumbency strength particularly of GE," he said.

General Electric, in partnership with France's Safran SA, exclusively powers Boeing 737s and has about 50% of the market for Airbus A320 jets.

How to structure a future engine partnership will likely be determined by Warren East, who replaces the retiring Mr. Rishton in July. A decision is not urgent, Mr. Rishton said, with a new plane to use such an engine not on the horizon until around 2030.

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

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