Boeing reported a $5.4 billion loss for the third quarter on Wednesday as persistent certification delays for its 777X aircraft forced the company to book an additional $4.9 billion charge, according to an AFP report.The aviation major, however, posted a 30% year-on-year rise in revenue to $23.3 billion, driven by higher commercial jet deliveries. But the strong topline growth was overshadowed by the one-time hit on the long-delayed 777X programme, which continues to face an extended certification process with US aviation regulators.Chief Executive Kelly Ortberg pointed to the Federal Aviation Administration’s recent approval for a higher monthly production rate of the 737 MAX as a sign of progress. He also noted that Boeing generated positive free cash flow during the quarter — a metric closely tracked by Wall Street.Ortberg, however, acknowledged that the company still faces challenges in rebuilding its operations and reputation after multiple safety lapses, including the two fatal 737 MAX crashes in 2018 and 2019 that brought stricter FAA scrutiny.Boeing has now pushed back the commercial launch of the 777X to 2027 from its earlier 2026 timeline. “While we are disappointed in the 777X schedule delay, the airplane continues to perform well in flight testing, and we remain focused on the work ahead to complete our development programs and stabilize our operations,” Ortberg said.In 2020, Boeing had booked a $6.5 billion charge on the same programme amid the protracted certification process and weak airline demand during the Covid-19 pandemic. Ortberg told CNBC there were no issues with the aircraft’s engine or airframe but admitted the company had “fallen behind” in obtaining FAA authorisations for flight testing.He added that while the ongoing US government shutdown could have a “minor” impact, it was not responsible for the current charge.Meanwhile, Boeing’s defence operations in St. Louis are “effectively executing” contingency plans after more than 3,000 workers rejected the company’s latest contract offer, Ortberg said in a message to employees. Local management has begun hiring replacement staff, while union leaders accused Boeing of refusing to negotiate in good faith.Shares of Boeing fell 4.1% in early trade following the announcement.