Fog was predicted for Monday 26 December 2022's morning in SYD, and must be present as JL51 looks to have diverted, possibly down to CBR from SYD.
OD171, the Christmas night 2110 hours redeye from DPS to SYD (B738 9M-LRL) took off at 2240 hours. On Monday 26, it is displaying as arriving 68 minutes late at 0723 hours but the queue of arriving aircraft given the fog may blow this out. QF44 on the same route managed to land just before 0650 hours so the airport must be OK for arrivals.
UPDATE: By 0718 hours, expected at gate arrival had changed to 0744 hours, 89 minutes tardy. The flight was holding northwest of Marulan.
FURTHER UPDATE: The flight landed at 0751 in SYD so arrival at gate becomes 0756 hours, 101 minutes late.