Maximise about 2.5 Lack flight tickets

Hey folks, I have an axis atlas card with a limit of about 1.9 Lakhs. I am going to book two tickets for my parents from New Delhi to Canada, and the return cost of journey is about 2.5 Lakhs. I am going to book the tickets from Air India.

Questions:
- How can I pay for both the tickets using my Atlas when my limit is under the total cost?
- How to maximise the returns on booking the ticket?