"The crew of flight AI639 operating from Mumbai to Chennai on Friday made a precautionary air-return to Mumbai due to a burning smell in the cabin," an Air India spokesperson said.
"AI 581, operating on the Mumbai Calicut sector, came back at 6.25 am after pushback at 6.13 am owing to a technical issue. After engineering checks, the flight is now ready for take-off," the Air India spokesperson said.