On Air India Day, the national carrier has topped aviation regulator DGCA's list of airlines that passengers have complained against the most.
Almost 30 percent of passenger complaints are related to troubles with flight cancellations or delays, while about 25 percent of passengers expressed discontent over customer services.
The DGCA has warned airlines to check and rectify instances of rude or unhelpful behaviour of their staff at airports and in the aircraft.
Air carriers have also been told to improve quality of service particularly when the flights have been delayed or cancelled.
The regulator has been carrying out surprise checks on various airlines.
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