As many as 23 Air India pilots reported sick leading to cancellation of 10 international flights and the state-owned airline could face more trouble with around 100 pilots threatening to quit.

The pilots belonging to the Indian Pilots' Guild (IPG), which has pilots of the erstwhile Air India as its members, are headed for a confrontation charging the management today with adopting discriminatory attitude against them and stalling their career progression.

The Gulf sector remained unaffected but the Kolkata-Dhaka and Chennai-Singapore sectors were hit, the sources said.

The threat to quit came four days ahead of the launch of a training programme for pilots to fly the Boeing 787 Dreamliners, the first of which is expected to join the airline by December.

A total of 101 pilots signed the letter claiming they felt "cheated by the management's unfair and discriminatory decisions, leading to a complete stall of our career progression", IPG sources said