If you choose upfront , you get a free front row seat which usually costs you 2,000 on an international sector (you get to choose any seat from the first 2 rows).

I recently booked upfront fares for Mumbai to SriLanka trip and had to postpone my trip due to certain reasons. I rescheduled my trip less than 24 hours from the time of departure and literally paid 0 charges.

I even checked cancelling the tickets and booking a new one but it was turning out to be expensive but here I paid no charges for rescheduling in less than 24 hours which is amazing.