Armed personnel will be on alert till month-end and they will keep watch on the recently constructed flyover near the airport as those travelling on it would have a full view of the airport, officials said.
The Centre had already warned of terrorists' plans to hijack Indian aircrafts operating between SAARC countries following which security had been beefed up at Chennai airport, with entry of visitors banned till January 31.
In Tamil Nadu, Chennai has already been brought under a security cover with vigil intensified on borders and coastal areas. A 12,000 strong police force will guard the city on the occasion of Republic Day celebrations.