I'm a 1K trying to redeem a RPU but they never seem to go through. I applied them to several DTW -> EWR routes over the summer but I was always waitlisted. They would then expire at the 24-hour mark where I would then be put at the mercy of CPU. On the upgrade lists, it would always show other people having been upgraded before the flight. And due to the RPU waitlist expiring, those on top of the CPU waitlist would get the last minute upgrade. I recently also applied some RPUs to EWR -> LAX and SFO -> EWR but was also waitlisted. Just hit the 24-hour mark for EWR -> LAX and I'm seeing other people were already upgraded. What am I doing wrong? Are RPUs only good for flights where you're sure you will get a CPU?