However, because McDonnell Douglas did not have any experience with the requested Remote Aerial Refueling Operator (RARO) system, and because the third aircraft differed from the original two, the program could not be completed at budget.
Međutim, kako u McDonnell Douglasu nisu imali iskustva s traženim sustavom s daljinskim operatorom nadopunjavanja goriva i radi trećeg zrakoplova koji se razlikovao od prva dva, program nije mogao biti izvršen u proračunu.