The incident happened at Air India's flight to Male from Chennai via Thirunanthapuram, sources said.
In between, the commander also complained of high blood pressure and was treated for the same, they said.
Interestingly, the Commander quit Air India last week and is serving a six-month notice period, the sources said.
According to the sources, the commander insisted roster section yesterday to schedule the woman flight officer along with him on flight AI 263/264 for today.
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Later the commander called up roster section and threatened to report sick, if the particular woman pilot was not assigned the duty with him.
"When the roster section did not oblige, he reported sick yesterday. But this morning when he turned up to operate the flight he again insisted for the same co-pilot, forcing the airline to arrange his favourite co-pilot," one of the sources alleged.
But in the process, the flight was delayed as it departed at 9.13 am against its schedule time of 7 am, the sources said.