[Gwypaas]

More complicated than that. Northrop Grumman and EADS/Airbus in a joint bid won with a more capable platform, it was then redone due to Boeing protesting. In the redo Boeing won.

Comparatively the A330 MRRT, which the first round winning bid was based on entered service June 2011.

https://en.wikipedia.org/wiki/KC-X