Originally Posted by jsloan

Same PNR — which this is — doesn’t make much of a difference here. Vistara isn’t going to honor UA’s Platinum status allowance, same PNR or not, nor would the DOT force them to do so.

The rather convoluted logic is that the charge still applies (as part of the underlying ticket); UA merely elects not to collect it. Vistara will not be so magnanimous, and will use the standard UA Economy allowances.