The issue seems to be the want of a more advanced system for boom refueling then was in specs. The old system was deemed fine for non stealth aircraft but they have stealth aircraft now. That have a more fragile coating that can be disturbed by old type of refueling. But what do you know there are new active control booms that will fix that problem. Just a question of who is going to pay for it. The Air Force are Boeing I guess they will be some rather careful readings of the contract by both side to figure it out.