Around 1,000 members of the Airports Authority Employees Unions (AAEU) took part in the protest at the airport here.
The protest, part of a nationwide stir, would be intensified further, AAEU Regional Secretary L George said.
A report from Coimbatore said nearly 130 AAI employees commenced an indefinite relay hunger strike at the city airport today.
The employees are protesting the Centre's move to privatise airports at Chennai, Kolkata, Lucknow, Jaipur, Ahamedabad and Guwahati.
