Retto Charters was the only other Kokoan operator of the 747, owning or leasing over the years a total of 13 airframes -with ten being in service at the same time at its highest- split between two 747-100B, three 747-200B, two 747-300 and six 747-400s.
The airline ordered two 747-100B in 1978, recieving one the next year and the second in 1981, one of the world's only three operators of the type, the other being Saudi Arabian and Iran Air. The aircrafts operated on scheduled service (the carrier first) between Toumachi and Honolulu, and on charter service to Bangkok and Noumea. As the 747-200 and -300 later joined the fleet, Retto's 100B were moved to other routes and ended serving flights to Tokyo and Kailua (Hawaii). The type was withdrawn from service and stored in late 1990 as a cost-cutting measure while the gulf war exacerbated towards its peak causing fuel prices to go up. Even after the end of the fuel prices spike the two planes remained in storage and were eventually sold to Saudi Arabian in 1992, from there they somehow ended up beign sold to Iran Air by the end of the year, and kept flying until 2014.
Retto also ordered two 747-200B in 1980, with deliveries made in 1982/83, themselves another little oddity in the airline world. They were one of the very few planes fitting the P&W JT9D-70A engines and the only full-passenger ones (SAS had the combi, and both Seaboard and Cargolux ones were freighters). Their arrival allowed Retto to add Higashinada and Guam to its destinations. One of the airline two 747-200s was also the first plane to be repainted with the new livery in 1986; canges were subtle, the cheatline sweeps forward and aft were deleted, moving to a straight line which no longer connected to the vertical stabilizer. The 'Koko Charters' title on the fuselage was made bigger, with the font of the western-styled part changed, The kanji disappeared from the engines, replaced by the airline logo.
A third 747-200 was also leased between 1999 an 2003 from Air Atlanta Icelandic to fill capacity needs before newer planes got delivered (something that ultimately did not materialized). The airframe was a former Japan Airlines machine which had flown with its first owner between 1974 and 1996. Interestingly, a new livery debuted on it as well, worth of mention as both Retto livery changes happened on 747-200s. The bare-metal fuselage and engines were now painted light silver and the cheatline was dropped. The airline titles were now all written in western style, but retaining the Japanese pronunciation of the world 'retto' (meaning archipelago), which was now dominant on the fuselage over a smaller 'charters' which lied below the cabin windows.
The two owned 747-200s served until retirement in 2009, as a consequence of the 2007/08 recession route-cuts. Both were stored until the airline closed down in 2012 and scrapped shortly after.
In 1988 the airline recived a single 747-300 to cover routes to Naha (Okinawa) and Sapporo. A second, used airframe was then purchased in 2004 from South African Airways (after the used 747-200 was returned to Air Atlanta). This plane had been originally delivered to Singapore Airlines (1983-1996) and then sold to SAL (1996-2004), and served chartered southeast-Asia destinations (Bangkok, Denpasar, Jakarta, Manila, Ho-chi-min, Hanoi) under Retto Charters. Both -300s were retired in 2010. The used one was cannibalized for spares and scrapped in 2012 just after the airline stopped flying. The other was the only airframe that Koutei Koku actually took over, although it kept it stored as well to provide maintenance parts (except engines which were not compatible) for its fleet of converted 747 freighters. This airframe was scrapped as well in 2016.
The arrival of the 747-400 marked the largest service expansion in the history of Retto Charters. While it got delivery of four between 1990 and 1994, the airline opened nine new destinations (one domestic, eight international), both scheduled and charter ones, three of them (Cairns, Brisbane and Sydney) in Australia alone. Retto's 747-400s also replaced the-100Bs on flights to Tokyo, Noumea, Honolulu and Kailua. In the late 90's the airline ordered six more, with the aim of replacing its older fleet of -200s and further expand its resort-oriented routes. The first airframe was delivered in late 1999, then as a stop-gap measure the airline leased a brand new 747-400 from Koutei Koku (the only aircraft in the entire history of Retto Charters to be powered by GE engines instead of PWs). When 9/11 indirectly affected air travel, reducing overal demand in the following months, the leased aircraft was returned to Koutei, while the other five on order wer deferred at first, then canceled altogether in 2004. When Retto kido stopped flying in 2012 its five 747-400s took the skies for other countries. One, the newest one delivered in 1999, went flying for Transaero, the other four were bought two each by United and Delta Airlines, which kept them stored for parts.