South india has big INTERNATIONAL airports in all its capital cities (Chennai, Trivandrum, Hyderabad & Bangalore). This airport infrastructure is lacking in north.
The only states where ultra modern international airports is available in TIER II cities are Tamilnadu and Kerala.
Apart from state capital Trivandrum, Cochin International Airport is the newest international airport in india after Hyderabad GMR airport. Cochin is TIER II city in Kerala.
New Ultra modern International terminal is getting built in TRICHI INTERNATIONAL AIRPORT - Tamilnadu. Coimbatore Terminal is another International airport in Tamilnadu.
Now TN government is trying to convert Madurai domestic airport to International airport.
Apart from Cochin & Trivandrum kerala has international airport at CALICUT also.
Small state kerala is trying to create one more international airport in kerala also. If they succeed it would be the fourth international airport in Kerala.
Karnataka is trying to make Mangalore as another international hub for their state. Andhra is trying to make Vizag as another hub for their state.