Originally Posted by
brillantesg
I believe if you book Y, then within 72 hours of departure you'll be able to just move up to C+ no extra charge. I recently was flying BCN-JFK as SM and was able to move from main cabin to C+ at no extra charge within 24 hours of departure. Just check the seat map within the time frame to see if there are any available C+ to change to.
72 hours is for GMs, PMs and DMs are Eligible for C+ after booking.