The document discusses the domino effect of issues related to Rolls Royce Trent 900 aircraft engines. It notes that a small nozzle less than 20cm in length caused an accident, which was outsourced by Rolls Royce. This led Qantas to ground 6 Airbus A380s for 23 days at a cost of $200 million due to engine risk from Rolls Royce Trent 900 engines, while carriers using Engine Alliance engines faced no issues. It also mentions Boeing is launching its new Superjumbo aircraft soon.