Hello! Was forwarded this way from Reddit and hope I could get a more clear answer on my dilemma.

We booked a multi-city ticket with Delta -> SFO -> LHR and then CDG -> SFO (taking the train between London and Paris... assuming the upcoming strike doesn't bone us). The flight is being code-shared where the SFO -> LHR leg is on Virgin Atlantic and CDG -> SFO leg is on Air France.

My dilemma is as following: one of our check-in bags is lightly over the 158 cm a+b+c dimension limit for Air France (it's a Samsonite f'lite 30 if anyone is wondering) however it is well below the limit for VA (205.74 cm linear). Who's baggage allowance rules take effect in this scenario? Delta's appear to be 157 cm but if I check in with VA an submit my bag, does it then mean that AF is obligated to honor their dimensions (will they even care?)?

If this is the wrong place for this question - I do apologize...

Thank in advance!