IndiGo
IndiGo flies CCU–DAC nonstop and BluChips offset the fare at roughly ₹0.40–0.60 apiece (min 500), own metal only. Biman and US-Bangla fly it too but neither runs an Indian-feedable program, and no oneworld or Star carrier is on the route — so no Avios band, no partner award. On a one-hour, low-fare hop that's fine: it was always a cash flight.
Estimate IndiGo BluChip is revenue-linked ~Rs0.50/pt; ~= typical one-way IndiGo economy fare / Rs0.50 for ~149 mi - a rupee offset that moves 1:1 with the live fare. Own-metal only, no partners.
Feed it: 10,500 HSBC Reward Points (1.5:1 via Accor Live Limitless (ALL)) · 35,000 Axis EDGE Reward Points (5:1) · 21,000 HDFC Reward Points (3:1 via Accor Live Limitless (ALL))