As Findark said, a diversion was called and then cancelled. That really shouldn't leak into the public side. Once the diversion is input, it can't just be removed. Instead, the stop needs to be cancelled resulting in the "overflew." It gets cleaned up later for the final records. There's really no reason to show that an unscheduled stop was cancelled and having done airline performance reporting in the past, having a cancelled unscheduled stop in the final records would just make a complicated process even more complicated (one of our simplifying assumptions was that a diverted flight did not arrive at its scheduled destination on-time; that would not be true if cancelled diversions were in the final records)..