McDonnell-Douglas DC-10:
The most represented widebody type in Koko Airways fleet was the DC-10. Between 1973 and its final days the airline operated 23 of them: 13 of the domestic -10series and 5 each of the long-range -30 and -40series.
When traffic figures grew well over what the DC-9 could handle in the early 70s KOA became the second Kokoan airline to order a widebody jet with a deal for nine aircraft signed with Douglas. The large trijets were delivered between 1973 and 1976 to serve routes between the cities of Toumachi, Hoshiguma, Kumoi, Taniguchi and Minatogawa and featured the new 'all green' livery of the airline. A Tenth airframe was delivered in 1978 to increase capacity on the Hoshiguma-Toumachi route. Four more followed in 1980-81 for a total of thirteen. KOAs DC-10-10s remained the backbone of the high-density domestic fleet until the late '90s. Three were retired in 1998-99, replaced by Boeing 777-200s, the other ten were axed between 2001 and 2003 as a cost-cutting measure.
In addition to the domestic -10series, Koko airways also ordered the long range DC-10-40 to open its first international routes, becoming the only airline other than Northwest, PanAm and JAL to operate that model. In 1976 the first two aircrafts started to fly daily between Hoshiguma and Tokyo, a thid aircraft was delivered in 1977 to operate seasonal routes to Okinawa and Honolulu. Two more were delivered in 1983 to fly to and from Osaka. KOAs DC-10-40s were moved to the US west-coast routes in the early 90s, serving Honolulu, San Francisco and Los Angeles, then they were shifted again to China (Shanghai and Hong Kong) late the same decade. One of them suffered the worst hull loss in the history of the airline on February 16th 2000. While taking off from Shanghai International Airport, bound for Hoshiguma, a DC-10-40 with 274 passengers and 14 crew suffered an engine failure jest after lifting off. In the confusion of the moment, the co-pilot istinctively reduced throttle while the captain pulled the yoke to contine climbing, which caused the aircraft to stall after it reached a little more than 60 feet of altitude. Once realizing the error of his crewmember, the pilot applied maximum thrust in an attempt to recover, but too late. The plane hit back the runway violently, causing the right main landing gear to fail and the right engine to hit the runway as well. As the wing itself failed, spilling fuel which ignited in a fireball the aircraft overshoot the runway and broke in two before being consumed by the post-crash fire. Astonishingly, despite 86 serious and 174 minor injures no-one was killed, in what has been known since then as the "Pudong miracle". The other four -40s were retired in 2004-2005.
When Koko Airways decided to further expand its international routes during the second half of the 80's -adding San Francisco, Seoul and Hong Kong to its network- the DC-10-40 was no longer in production, so KOA had to adapt and order the GE powered -30series in order to maintain an homogeneous fleet of Douglas trijets. On the plus side, while its fleet was Pratt & Whitney-dominated, the DC-10-10s had GE engines as well. The fisrt of the -30series was delivered in 1986, followed by three more factory-built planes in 1988-89. A fifth, this time used, airframe was bought in 1990. During the decade, the -30s were moved from Chinese to Japanese routes to replace the -40s that had been in turn moved to the US-bound routes. This last DC-10 variant remained in service with the airline almost to its very end, as KOA started to withdraw them in 2006. The last beign stored just weeks before the airline final demise.