I have a SBI Air India Visa Signature credit card with limit of ₹1,40,000 since last 8 months. Inspite of trying many times even with payslip, bank statement they have not increased my limit. I want to buy tickets to USA on Air India worth ₹3,00,000 for my parents using this credit card. I want to make a single transaction so that the PNR number remains the same. How do I go about it ? Is there anyway I can prepay the amount to have a negative balance & use the card to book tickets ? My credit score is 780 with clean history. What is the point in having a cobranded credit credit card if I cannot use it to make transaction with that brand itself ?