Got the first refusual
Please be informed that despite all endeavours to maintain operations as per the published schedule, at times due to circumstances beyond its control, the Airline is compelled to resort to rescheduling involving delays. Although, no effort is spared by the Airline to minimize the extent of delay which in the present case was primarily due to unavoidable and unexpected operational constraints.
We would like to address the issue of compensation for the cancellation /delay of your flight. Unfortunately, the cancellation/delay was due to a airport traffic issues, which is beyond our control. As per safety regulations, airlines are not permitted to interfere in the flights when these issues are identified, prioritizing the safety of both passengers and crew. Regrettably, in such cases, passengers are not eligible for compensation.
The aircraft overnighted in DEL before the flight to KTM so it couldn't have been an inbound flight caused the delay. All other KTM to DEL flights that morning were operating basically on time including the Indigo 40 minutes later.
Is it worth going back to them again or just do the chargeback?