Originally Posted by
Lawyerneering
How is No. 3 different from what a 1K can do (except for the fare class an upgrade will clear)? I've traveled on paid F tickets and upgraded my wife from economy into first/biz using RPU/GPU.
1K GPU upgrades into R but GS upgrades into PN and PN is more frequently available, plus of course a higher priority, but otherwise it is similar.