My IFR flight from AVX to SMO in N6834R on 12/9 never showed up. It was filed with FSS and departed IFR. It was not a pop-up in other words. Departed about 0240z, which was kind of cool because Catalina normally doesn’t allow departures after dark. The outbound flight the other way an hour or so before is there, though.
I looked at other threads about this but didn’t find a current explanation.