'The Regional Labour Commissioner had categorically stated that any strike by the pilots during this pendency of conciliation, would be deemed an illegal act, as per the Industrial Disputes Act,' the spokesperson told IANS Tuesday morning.

According to an airport official, by 7 a.m. as many as seven flights from Mumbai and nine from New Delhi to various destinations had been cancelled. However, the situation could become worse as the day progresses with the likelihood of flights to more sectors getting hit.

Jet Airways has said that passengers can get either a full refund or re-book themselves on any other flight even as it made efforts to operate the maximum number of flights.