A few weeks ago the Yomiuri News on-line reported the following:
On the 12th (August) the government held its vetting committee on “plane for governmental use” (chairperson: Deputy Chief Cabinet Secretary Kazuhiro Sugita), it decided to entrust the supply and maintenance of the planes to All Nippon Airways while the succeeding aeroplane model for government use to be introduced in fiscal year 2019 would be the large-sized machine "777-300ER" of the U.S. Boeing.
There was a competition to get the contract between All Nippon Airways and Japan Airlines as the latter was presently providing the plane maintenance. All Nippon Airways "as a result of getting minute points in the price offered and in the performance of crew training equipment etc." was declared the winner (by the Cabinet Secretariat management).
Although 777 was almost the same size as the Boeing "747- 400" presently in use, its cruising range was increased by 1000 km and was thus extended to about 14,000 km. Fuel consumption improved by 30 percent. Also included was the purchase of two spare planes same as the present; and the Air Self Defense Force would operate them.
The present planes which served as the founder were introduced in 1991. Their maintenance was all along contracted to the Japan Airlines. In selecting the succeeding planes the government suggested to lump the plane delivery and maintenance duty into one package, the two companies of All Nippon Airways and Japan Airlines both at the same time responded by suggesting the 777.
It seems that ANA is keen to compete with JAL for business.