mds1978,
You do indeed get the last laugh. Although there are several scheduled flights between Sydney and Broken Hill, most connecting in Dubbo, the actual flights taken by AR18 teams were a charter at 605am and another charter at 630am. Here is the regular schedule:
   
Rex - Regional Express Airlines
Flight 878   SF3
More Information       Sydney (SYD)
Broken Hill (BHQ)    06:20pm -23Nov, Wed
08:20pm -23Nov, Wed    Nonstop
Coach
2hr 30min
   Flight Duration : 2hr 30min       Total Trip Time: 2hr 30min    
$335
   
Rex - Regional Express Airlines
Flight 836   SF3
More Information       Sydney (SYD)
Dubbo (DBO)    07:10pm -23Nov, Wed
08:20pm -23Nov, Wed    Nonstop
Coach
1hr 10min
Connecting flight wait time 15 hours 10 minutes
   
Rex - Regional Express Airlines
Flight 862   SF3
More Information       Dubbo (DBO)
Broken Hill (BHQ)    11:30am -24Nov, Thu
12:45pm -24Nov, Thu    Nonstop
Coach
1hr 45min
   Flight Duration : 2hr 55min    Layover Time : 15hr 10min    Total Trip Time: 18hr 05min    
   
Rex - Regional Express Airlines
Flight 834   SF3
More Information       Sydney (SYD)
Dubbo (DBO)    04:55pm -23Nov, Wed
06:05pm -23Nov, Wed    Nonstop
Coach
1hr 10min
Connecting flight wait time 17 hours 25 minutes
   
Rex - Regional Express Airlines
Flight 862   SF3
More Information       Dubbo (DBO)
Broken Hill (BHQ)    11:30am -24Nov, Thu
12:45pm -24Nov, Thu    Nonstop
Coach
1hr 45min
   Flight Duration : 2hr 55min    Layover Time : 17hr 25min    Total Trip Time: 20hr 20min    
$335
[Total Incl. fees excl. taxes]
   
   
Rex - Regional Express Airlines
Flight 832   SF3
More Information       Sydney (SYD)
Dubbo (DBO)    03:30pm -23Nov, Wed
04:40pm -23Nov, Wed    Nonstop
Coach
1hr 10min
Connecting flight wait time 18 hours 50 minutes
   
Rex - Regional Express Airlines
Flight 862   SF3
More Information       Dubbo (DBO)
Broken Hill (BHQ)    11:30am -24Nov, Thu
12:45pm -24Nov, Thu    Nonstop
Coach
1hr 45min
   Flight Duration : 2hr 55min    Layover Time : 18hr 50min    Total Trip Time: 21hr 45min    
$335
[Total Incl. fees excl. taxes]
   
   
Rex - Regional Express Airlines
Flight 828   SF3
More Information       Sydney (SYD)
Dubbo (DBO)    12:20pm -23Nov, Wed
01:30pm -23Nov, Wed    Nonstop
Coach
1hr 10min
Connecting flight wait time 22 hours 0 minutes
   
Rex - Regional Express Airlines
Flight 862   SF3
More Information       Dubbo (DBO)
Broken Hill (BHQ)    11:30am -24Nov, Thu
12:45pm -24Nov, Thu    Nonstop
Coach
1hr 45min
   Flight Duration : 2hr 55min    Layover Time : 22hr 0min    Total Trip Time: 24hr 55min    
   
Rex - Regional Express Airlines
Flight 862   SF3
More Information       Sydney (SYD)
Broken Hill (BHQ)    10:00am -23Nov, Wed
12:45pm -23Nov, Wed    1 Stop
Coach
3hr 15min
   Flight Duration : 3hr 15min       Total Trip Time: 3hr 15min    
   
Rex - Regional Express Airlines
Flight 824   SF3
More Information       Sydney (SYD)
Dubbo (DBO)    08:20am -23Nov, Wed
09:30am -23Nov, Wed    Nonstop
Coach
1hr 10min
   
Rex - Regional Express Airlines
Flight 862   SF3
More Information       Dubbo (DBO)
Broken Hill (BHQ)    11:30am -23Nov, Wed
12:45pm -23Nov, Wed    Nonstop
Coach
1hr 45min
   Flight Duration : 2hr 55min    Layover Time : 2hr 0min    Total Trip Time: 4hr 55min    
   
Rex - Regional Express Airlines
Flight 822   SF3
More Information       Sydney (SYD)
Dubbo (DBO)    06:30am -23Nov, Wed
07:40am -23Nov, Wed    Nonstop
Coach
1hr 10min
   
Rex - Regional Express Airlines
Flight 862   SF3
More Information       Dubbo (DBO)
Broken Hill (BHQ)    11:30am -23Nov, Wed
12:45pm -23Nov, Wed    Nonstop
Coach
1hr 45min
   Flight Duration : 2hr 55min    Layover Time : 3hr 50min    Total Trip Time: 6hr 45min