Last week I got an email from United Airlines offering me 4 upgrades for flights within the US. If I wasn't in the process of moving back to the US this wouldn't be any help to me, but since I'm moving I might actually be able to use these. Now my question is how did UAL know that I was moving back? I haven't updated my address yet and my one-way flight to the US is booked on British Airways. Hmm maybe there are spies out there watching me.