So how does that apply in the case I made the for the OP? In the case as I provided it, it would be the OP asking for an alternate city, not the carrier “offering” it in lieu of departing out of BOM.

Also, what defines “town, city, or region?” and/or “close by”? Are DEL and BLR considered the same “town, city, or region” or even “close by” to BOM for the application of what you posted/cited?