Upgrading on AI143 MAA-DEL-CDG
I'm ticketed in J on this flight in October and was trying to dump some 90k odd AI miles by processing a J-F upgrade on the DEL-CDG leg, which is on a Dreamliner.
So far two AI staff have informed me that this isn't possible as the MAA-DEL leg, also operated as AI143, is on a two class 320.