An Aircraft Commerce study comparing 14 widebody aircraft-engine combinations across five routes found that the GEnx-powered Boeing 787-10 produces the lowest fuel burn per available seat mile of any widebody configuration currently in service. The 787-10 with GEnx engines produced the lowest combined fuel burn and en-route ATC charges per ASM across the five routes tested. The study noted that the 787-10s "overall steal the show," with fuel burn per seat that the other 13 combinations could not match. The ranking matters because airlines selecting widebody aircraft are not choosing between airframes alone. On those routes, the 787-10 with GEnx engines produces a lower cost per ASM than any other widebody combination the Aircraft Commerce study measured.