Boeing (NYSE: BA) appears to really have its work cut out for it. Boeing’s CEO Kelly Ortberg noted that the Boeing 777-9’s certification schedule is significantly behind schedule, with its first delivery now set for 2026, a full six years behind schedule. This is certainly a concern for investors, as Boeing 777-9 deliveries are a key portion of the airline’s medium-term cash flow picture. The manufacturer noted that it was facing a “mountain of work,” also commenting that no new technical issues had arisen.