Causes for Replanning
The primary cause for replanning in the corporate aviation environment is weather at the destination, but unlike airlines, the imperative goal is providing timely transportation for the passengers to their intended destination. In this regard, the flight crew will frequently develop a candidate list of alternatives and ask the passengers which alternative they would prefer to execute. Examples of these alternatives would include:
1.  
immediately landing at the nearest available airport and obtaining ground
transportation

2.  
holding to see if the weather ‘clears up’

3.  
land and refuel at a nearby airport and wait for the weather to ‘clear up’

4.  
etc.

Replanning / Information Processing Loop
Considerations of Consideration of
Separation Assurance, Individual Flight Safety
Similar to General
Traffic Flow Management, and and the Need for
Third Party
Aviation, the
Overall System Capacity Changes to the Plan
Flight Plan
Supplier
Corporate pilot or
ATC Flight Crew
flight crew is largely unsupported in their rerouting
ATC Flight Crew
decisions, see Figure 8.
ATC Flight Crew
ATC Flight Crew
ATC Flight Crew

Figure 8. Information processing loop associated with replanning (Corporate Aviation)

Greatest Inefficiencies
Similar to General Aviation, the inability to obtain real-time weather information is the key obstacle to efficient operations.
Airlines

Causes for Replanning
One of the major carriers provided the following list as possible causes for in-flight replanning:
.  
Destination change

.  
Alternate change

.  
Reroute (For weather, ATC, or other reasons)

.  
Significant change from planned en route winds

.  
New re-release analysis

.  
Use to provide a better (more accurate) assessment of the flight’s
performance for flight following

.  
Search for optimum route / altitude

.  
On-time performance

.  
Airport curfew

.  
Crew legality

Replanning/Information Processing Loop
As a follow up to the previous list, the major airline was asked if there was a sequence, or order to the tasks involved with flight planning within the AOC. The answer follows:
.  
New route construction

.  
New route initialization

.  
Access latest upper air weather data

.  
Input other desired variables (alternate, fuel load, aircraft weight,
current position, etc.) into replanning system

.  
File with ATC as necessary to forward to international ATC centers
　
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