India has a soaring ambition to modernise its air force, built around a fleet of domestically developed fighter jets. Yet production of these aircraft has been hampered by engine delays and other bottlenecks that defence analysts say could limit its ability to fight future air wars. On October 11 at an airbase in Jodhpur, Air Chief Marshal A.P. Singh strapped into a Tejas jet for the last time. It was his final fighter sortie before retiring later this month and he flew it in an Indian-built jet...