New Delhi, Dec. 7 -- Hard-fought regulations designed to protect both aviation safety and pilot wellbeing-won through 13 years of litigation catalysed by a 2010 crash that killed 158 people - have been undone to accommodate an airline whose mismanagement did not prepare despite ample notice, experts and pilots have said. The Directorate General of Civil Aviation on Friday granted IndiGo sweeping exemptions from crew fatigue standards that pilot unions fought for over a decade to establish, eight months after the Delhi high court disposed of the case believing India had finally achieved enforceable protections aligned with global benchmarks. The regulatory retreat, prompted by IndiGo's cancellation of hundreds of flights due to what the airl...