Originally Posted by
exerda
They can ask for proof of residence, but they cannot ask for receipts from other airlines.
The requirement is not that you have a foreign residence, only that you get your MP stuff mailed outside the US.
"The Premier qualifying dollar (PQD) requirement only applies to members whose primary MileagePlus account address is in the 50 United States or the District of Columbia"
Does not say you have to live there.
That is quite different from Delta, who says "U.S.-based members". So for DL it matters where the member is based, for UA it matters where their mail goes.