The chairman of Japan Airlines (JAL), which has had to ground its entire fleet of the Boeing 787 Dreamliner aircraft after a battery fire, told CNBC he had reservations from the start on relying on one vendor.

Chairman Kazuo Inamori told CNBC: "When I first became chairman of JAL in February 2010 I found out that 100 percent of Japan aircraft were made by Boeing - I felt that was abnormal."