EWR -> AMS R5 but no Saver Business
So I'm looking at UA 70 from EWR to AMS on Friday, 2/16 (before President's Day Weekend), and it's showing R4. However, there is no Saver Business Class open, which in my experience is usually correlated with R space. It's also showing P9. What do you guys think the odds are of Saver Business opening up on that flight?