New Delhi, May 23 -- Passengers flying through Delhi's Indira Gandhi International (IGI) airport could face significant inconvenience starting next month, with airport authorities deciding to cancel and reschedule about 100 flights daily during a crucial runway maintenance period. Approximately 50 flights will be cancelled and another 50 rescheduled starting June 15 until mid-September, three officials aware of the matter told HT, detailing plans for when runway 28/10 will be shut to upgrade the Instrument Landing System (ILS) to CAT III B standards-instruments that help pilots land in low visibility conditions common during Delhi's foggy winters. The slashing of services comes after a similar attempt in April led to widespread chaos in fli...