From Flightglobal:
KC-46 tanker testing will begin at least a year behind schedule - 1/23/2015 - Flight Global
Operational testing of the Boeing KC-46 aerial refueling tanker is expected to begin at least a year later than planned.
The US Defense Departments director of operational testing and evaluation (DOTE), in its annual report on ongoing development projects, says “readiness for the scheduled start of [the initial operational test and evaluation phase]continues to be high-risk with a 12-month delay expected.”
