The A350-1000 was launched alongside the A350-900 as the largest member of the XWB family. It is stretched by about seven meters and aims at the market the Boeing 777-300ER once ruled. Boeing's rival 777X kept slipping, which left the field wide open for Airbus. Orders followed from Emirates and Riyadh Air. Stretching the -900 rather than starting again kept costs low. Airlines liked the familiarity.
The first A350-1000 flew on November 24, 2016, and Qatar Airways began service in February 2018 between Doha and London Heathrow. Higher weights called for stronger parts: uprated Trent XWB-97 engines, a modified wing trailing edge, and six-wheel main landing gear in place of the -900's four-wheel units. Everything else stayed common with the smaller model. Pilots move between the two on one rating.
British Airways, Cathay Pacific, Virgin Atlantic, Japan Airlines and Etihad put it on flagship routes, replacing 747s and older 777s and cutting fuel burn per seat by roughly 25 percent. Qantas picked a special version with an extra fuel tank and a wellbeing zone for Project Sunrise, its planned nonstops from Sydney to London and New York. Those flights would be the longest scheduled passenger routes ever flown.