A Boeing KC-46A tanker has refuelled another KC-46A for the first time.

The work took place during a four-hour flight in which the two aircraft refuelled each other, says Boeing in a statement.

The pair achieved the maximum offload rate of 1,200 gallons per minute, and transferred 38,100lbs of fuel. The activity involved personnel from both Boeing and the US Air Force.

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Boeing

“The milestone flight helps pave the way for the next phases of certification and specification compliance testing,” says Boeing.

It adds that the KC-46 has completed 2,000 flight hours and 1,300 contacts with types including the Lockheed Martin F-16, as well as the AV-8B, A-10, C-17, and KC-10.

In late September, the USAF’s Air Mobility Command revealed that boom scraping issues and a slew of completed test points could delay delivery of the 767-based type until 2018.