Originally Posted by mlord

I see lots of postings complaining about perceived lack of upgrade space in advance on TATL flights, but my experience, with Latitude, PE(Lowest), and points bookings, has been 100% success with TATL eUps. We do book 5-8 months in advance though, and get instant upgrades.

So it exists, and works, for us at least. Booking much closer to the travel dates may mean that I have already snagged the R space you're looking for though!