The Seattle-based aerospace and defense firm won a $35 billion contract in February 2011 to make the tankers, based off the company’s 767 commercial planes.
Dennis Muilenberg, president of the company’s defense, space and security division, said the company is on target toward building the first 17 tankers by 2017.
The contract called for those tankers to be built by 2018 for $3.5 billion.
The company is making the tankers on the same production line as the 767, he said.
The company is currently in the preliminary design review phase, he said to Federal News Radio.