Originally Posted by
ByrdluvsAWACO
How? You can't possibly know of any issues related to weather, equipment, or crews while still in the air unless you are told by the crew. Even then, they may not know of certain issues.
The most common cause of connection problems through SYD are due to customs and the bus ride between T1 and T3. Anyone who is experienced with Domestic-International connecting in SYD should be able to determine the likelihood of a problem simply by knowing the boarding time of their connecting flight and the current time vs arrival.