So, I'm waitlisted for an J class upgrade on a flight this weekend, HKG-EWR. Waitlist will empty tomorrow. I called MPC this afternoon to see if I could nudge them to confirm. EF is showing J7C6D0I0W7R6E6. They wouldn't confirm. However, agent told me to call every day until the flight to inquire about confirmation. I've never heard of this before. Is this a standard practice? I assumed I would have to wait until departure date and try instant upgrade at the airport.