Boeing Co. said Wednesday it will try to sell its new aerial refueling tanker to South Korea as its long-running battle with Airbus Group NV expands from commercial jets into specialized military aircraft.

South Korea said this week it would invite bids by June for four tankers in a contract valued at around $1.3 billion that is expected to trigger offers from Boeing and Airbus, as well as others that might seek to convert some of the global glut in cargo jets into refueling planes.

Airbus last month won a coveted six-plane tanker order from Singapore, which had been identified by Boeing and the Pentagon as a potential customer for the KC-46A Pegasus, which the U.S. plane maker aims to have in service with the U.S. Air Force in 2017.

The Boeing-built tanker is one of the USAF's three priority programs that have been largely insulated from budget cuts, with Boeing winning the final contract in 2011 after an decadelong battle with a consortium that included Airbus.

Export sales are viewed as a part of keeping down U.S. costs on the Pegasus program, which the Government Accountability Office this week estimated will cost $45 billion, and the Pentagon plans to intensify its own overseas sales push for the plane at an event next week.

Maj. Gen. John Thompson, the Pentagon's head of the Pegasus program, said the Air Force would promote the tanker at a gathering of overseas defense attaches at Wright-Patterson Air Force Base in Ohio next week. Boeing plans to showcase a Pegasus flight simulator and other equipment at the event.

"The air force is doing what it can to assist Boeing in foreign military sales and direct commercial sales," said Gen. Thompson at a congressional hearing on Wednesday.

Boeing plans to build an initial 179 Pegasus tankers for the Air Force, and executives had previously identified countries in Asia, the Middle East and Latin America as potential customers for a jet that will start replacing an existing fleet of U.S. tankers with an average age of almost 50 years.

The Pegasus is a converted version of the Boeing 767 passenger plane and is due to make its first flight later this year, while Airbus is already selling its Multi-Role Tanker Transport based on its own A330 commercial jet.

Airbus said it is also in talks about selling tankers to India, having already secured orders from the U.K., Australia, Saudi Arabia and the United Arab Emirates.

Boeing said other, unidentified nations are interested in the Pegasus.

"We see a solid international market for the KC-46A," said a Boeing spokesman, adding that the company would "definitely" pursue a deal with South Korea. "We have received interest from multiple countries about the combat capabilities of the KC-46 and we continue to have active discussions with them."

While the Pegasus development program is on-time, it is over-budget, with the Pentagon forecasting that building the initial four jets may cost up to $5.85 billion compared with its initial estimate of $4.4 billion to $4.9 billion. The fixed-price deal leaves Boeing liable for all overruns above $4.9 billion.

Boeing doesn't disclose internal cost estimates or whether it expects the development phase to be profitable, though does expect to make money on the entire program, which is due to be expanded with two further phases that would grow the U.S. tanker fleet to 479 planes, as well as possible overseas sales.

Write to Doug Cameron at doug.cameron@wsj.com

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