Originally Posted by
hyungjoh
Hello,
I was just wondering if anyone knows that when you upgrade the gateway card to explorer card, will you get the 90 free baggage waiver along with it?
If not, is there any way to trigger the the free baggage on an existing flight?
Tried searching everywhere but can't find any good answers

Booked through amex travel and did not use my gateway card for the reservation.
TIA!
Assuming you are referring to
The requirement to purchase ticket(s) with the applicable United MileagePlus card will be waived for flights completed during the first 90 days following a new primary Cardmember’s account open date.
and if this applies to a Chase product upgrade from Gateway to Explorer -- I would guess yes
In the past purchasing an auxiliary item like E+ / upfare with an Chase card would trigger the bag waiver. Last reports were spotty on this and need a more recent data point.