Originally Posted by
3Cforme
Please be sure to document all one billion with applicable fare rules and conformance to MPM and routing requirements so the OP can make an informed decision.

There are billions of routings that are always possible. You will just pay mightily for them.
You can always do whatever you want by combining full F, J or Y tariffs around the world. Though I supposed that there are practical limits in these sorts of things. Pesky thing that practicality.