Originally Posted by
irishguy28
No, if taking an upgrade offer at checkin for only part of the journey, the increased luggage allowance would only count for the upgraded leg and not for any feeder flights either before or after the upgraded sector, and neither would you have any increased baggage limit on any return/further sectors on the ticket that have yet to be flown.
That's a very useful info thanks, meaning it's much before to buy upgrades in advance, cash/miles, because the luggage allowance on the long haul sector applies to all legs then.