Several pilots of state-run Air India have refrained from reporting to work and have called in sick over the issue of non-payment of their alliances by the airline.

A section of the airline's pilots called in sick and this affected flight operations in Delhi and Mumbai while flights are running normally in Kolkata and Chennai. As many as six flights that were scheduled to leave Delhi have been cancelled and two have been delayed so far due to the action by pilot, which may lead to a fresh strike.

About 22 pilots called in sick in Delhi and Mumbai has seen many delays but so far the airline has not cancelled any flights from the financial capital. The pilots say that they have not received their salaries and allowances for the past six months.

Meanwhile, Indian Commercial Pilots Association (ICPA) has said that it has not called for a strike and the pilot action is not a union strike. ICPA said that the pilots who have called in sick in Delhi have done that in their individual capacity.

According to reports, concerned pilots' association and the airline management will hold meetings today on the issue.