Provided by Dow Jones By Doug Cameron and Andrew Tangel Boeing Co. reported its sixth consecutive quarterly loss but said it is at an inflection point as production and delivery of new jetliners hinge on vaccination rates and trade relations between the U.S. and China. The aerospace giant resumed deliveries of 737 MAX and 787 Dreamliners during the quarter but continues to be dogged by quality problems. The company booked a charge on its work replacing the presidential jets that fly as Air Force One because of issues with a supplier. The patchy recovery of global air travel remains the biggest issue for Boeing and its huge supply chain, with domestic markets in the U.S. and some parts of Asia recovering to pre-pandemic levels while Europe and long-haul travel struggle.