Airbus and Lockheed are teaming up after the Air Force flagged an increase in the number of refueling aircraft required over coming years.

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Airbus is set to renew a long-running battle with Boeing to supply tanker planes to the U.S. Air Force after partnering with American defense giant Lockheed Martin.

The companies said Tuesday they’ve agreed to pitch Airbus’ A330 jetliner-based multi-role tanker transport, or MRTT, to plug a shortfall in the Air Force’s midair refueling capabilities and to develop entirely new programs. The structure of the collaboration is set to be worked out in the new year.

Airbus is again targeting the U.S. military-tanker market after a $35 billion contract to build 179 planes was controversially handed to Boeing in 2011. The U.S. company’s initial winning bid was overturned amid claims of impropriety and later awarded to its rival, only for Airbus’ own proposal to be blocked by U.S. authorities, with Boeing triumphing in a final decision.

Airbus and Lockheed are teaming up after the Air Force flagged an increase in the number of refueling aircraft required over coming years, in part due to higher utilization of existing planes that led it to issue a formal request for information to the industry in June.

The requirement could lead to the accelerated retirement of the U.S. fleet of KC-135 tankers, a sister model to the Boeing 707 that first flew in the mid-1950s.

Boeing, which has been the sole supplier of aerial refueling planes to the Pentagon since 1948, beat Airbus to the 2011 contract with the KC-46 tanker based on its 767 commercial jet — a model that has since suffered repeated delivery delays.

Toulouse, France-based Airbus’ failed bid was originally made with Northrop Grumman before the U.S. company pulled out amid the legal and political wrangling over the contest. Lockheed Martin, based in Bethesda, Maryland, will contribute its expertise in systems integration, manufacturing and maintenance involving large airlift and tanker aircraft, according to a statement.