I believed the "Mastercard lounges" are the Clipper Lounges.
For those who have patronised these lounges in DEL, BOM, CCU, MAA and COK:
1. How's the food and drinks selection?
2. And most important of all, are these lounges very packed with passengers?
I will be going through the domestic terminal of DEL and BOM soon flying on Y, so the above information will help.
Thanks in advance for your response and thank you Mastercard for these benefit. ^