Originally Posted by
rawilliam
24 hr rule is where it is at. Not the number of oceans crossed.
Assuming both flights are UA-operated: the computer is likely to require 2 GPUs (i.e., if you try it online). An agent can do it with one, but you may need to HUCA a few times to get it done, and you may never be able to do it if the agent doesn't think it's reasonable (e.g., LHR-IAH-CDG is probably a no-go; TLV-SFO-SIN would be more palatable).
Here's the specific text from the
T&C:
Stopovers require multiple upgrade products. A stopover for a single, one-way trip within the U.S. or between the U.S. and Canada is defined as longer than 4 hours in the connecting city. A stopover for a single, one-way trip to or from all other destinations is defined as longer than 24 hours in the connecting city.
I won't bore you with the myriad of ways that this definition is incomplete; suffice it to say that if you're doing "normal" things, you should be able to point to this.