Hi, how does one go about checking upgrade availability on 9W? I couldn't easily find it online and ExpertFlyer doesn't show it either.
I'm looking to purchase a GOI-BOM one way in economy and upgrade by miles to Premiere on 9W476 on 06/08/2016 (6th of August).
And how do you go about upgrading by miles? Is it in 'Manager My Booking' or by calling the customer service after booking the ticket?
Thanks in advance for any assistance.