The aircraft will be used to deliver humanitarian supplies from the US for the Alaskan Sudan Medical Project in the Jonglei region of South Sudan.
The aircraft, which has a capacity of 400 passengers and can carry over 20 metric tonnes of cargo, will become the 45th and the largest on its fleet.
The delivery of the supplies is supported by Kenya Airways, working with Boeing. The airline will in turn strengthen its long haul capability, paving way for the introduction of new continental routes. The plane will be delivered on Friday to Kenya Airways at its hub at the Jomo Kenyatta International Airport by its manufacturer, Boeing.