https://www.desidime.com/discussions/vistara-premium-economy-vouchers-available-2-vouchers?page=1#post_9288534
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Check for kolkata to delhi
Vistara Premium Economy Vouchers Available (2 Vouchers). Can be used on Any Domestic Destination
Can exchange for any vouchers in return Amazon/Paytm/Tata Cliq/Flipkart
DM for details