A total of 13 flights - eight from Mumbai and five from Delhi - were delayed by up to two hours till evening due to the protest, which began from early morning, official sources said.
"A section of Air India commanders is observing a go-slow since this morning. As a result of their protest, some 13 flights could not take off or land on scheduled time," a source said.
Air India, however, said that of the total nearly 300 flights, which are operated by the carrier per day, only three flights were cancelled due to the non-reporting of the commanders.
"Out of the total nearly 300 flights operated so far only three flights were delayed due to non-reporting of crew on time. All our flights are operating smoothly as per schedule," an Air India official said.
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The Civil Aviation Ministry had earlier asked the Labour Ministry to remove pilots and engineers from the workmen category to prevent them from going on strike.
Besides, armed forces and police personnel have also been kept out of the workmen category as they are governed by different laws.
"A clarification has been given by the Ministry of Labour and Employment regarding differentiation on the categories of pilots in Air India, i.E., between a pilot in command and a co-pilot," Air India said in a notification issued yesterday.
"Ministry of Labour and Employment has, after examination, in light of the duties and responsibility of PIC (Pilots-in- Command) in Air India, as referred under rule 141 of Aircraft @1934 and rules made thereafter observed that the duties and responsibilities of PIC are of the managerial and administrative nature which may not fall in the definition of the workman under section 2(s) of the Industrial Disputes Act, 1947," the notification stated.