By Tim Hepher and David Shepardson FARNBOROUGH, England (Reuters) – Boeing will seek to shore up its troubled 737 MAX 10 and 777X jets with orders officially worth over $15 billion from Delta Air Lines and Lufthansa this week, as the aerospace industry swelters at its largest event since COVID-19. Industry sources said the U.S. planemaker, struggling to maintain its duopoly with Europe’s Airbus, would strike early at the Farnborough Airshow, which opens on Monday, after months of talks to sell its largest single-aisle jet to Delta. Reuters first reported in March Delta was discussing an order …