Advise that never avail 'Air Asia' for domestic transit in India after (or before) flying in an International Sector. They charge you for extra luggage and do not honour the Int'l baggage allowance, which other airlines do in India or other places, with a proof of boarding pass/ booking.
I am flying in International Sector originating generally from Delhi/ Mumbai for quite sometimes, while availing Domestic Flight from Kolkata to Delhi (ticket booked separately). Today (May 19) as I was returning from overseas and took Air Asia (IAD 548) from Delhi to Kolkata, I was surprised to be charged heftily for the additional 6~7kg of baggage (21 kg vs 15kg). The Front desk Manager even refused to give concession for my returning student status. The experience was not good, comparing flying in with other domestic (India) airlines for the same purpose.