Originally Posted by
lkar
I'm assuming that in order to be eligible for an automatic upgrade, I need to have my US number in the system. Is that right?
That's right.
Is there any way to credit my US flights to another carrier while still preserving the chance of an auto upgrade?
You can try asking the agent to change FF numbers at the gate. Some have had luck with this but YMMV. You may find yourself crediting miles to the other FF program as you sit in the middle seat last row.
Jim