Replanning/ Information Processing Loop
The allocation of replanning information processing tasks for the package carrier is similar to that illustrated above for scheduled airlines (Figure 9).

Greatest Existing Inefficiencies
The inefficiencies experienced by the cargo carrier are not generally different from those of the airline, although the low traffic volumes at night mean that these inefficiencies are not confronted as often by the cargo carrier. The primary complaint about ATC operations is that they may be overly conservative in running capacity reduction programs and setting miles-in-trail requirements higher than might be needed. The need to continually call the tower to get RVR at the landing airports was cited frequently as a workload issue. The primary unique characteristic of the cargo carrier’s operation is the use of the sweep airplane, which must remain as flexible as possible; more than perhaps any other airline operation, the sweep airplane is characterized by constant replanning. Such frequent replanning can place heavy demands on ATC and cause them to become resistant to further changes. This suggests that the major change ATC could make to accommodate the needs of the cargo carrier is to better support flight operations that require constant replanning and refiling.

2.2.2.3 Replanning Scenarios
The purpose of this section is to provide real-world scenarios as examples of the sorts of procedures and inefficiencies experienced by both Air Traffic Service providers and different classes of Air Space Users. The treatment of real-world inefficiencies begins with two different Air Traffic Service provider facilities (ATCSCC-Air Traffic Control System Command Center and ARTCC-Air Route Traffic Control Center) followed by the four classes of Air Space User:
.  
General Aviation

.  
Corporate Aviation

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Airline

.  
Package Carrier

The remainder of this section is organized as follows:
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Air Traffic Control System Command Center - Scenario of severe weather affecting ZFW

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Air Route Traffic Control Center - Scenario of severe weather affecting ZFW

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General Aviation - Scenario of severe weather affecting flight from Roswell, NM to Decatur, TX

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Corporate Aviation - Scenario of severe weather affecting flight from Ensenada, Mexico to Love Field, TX

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Airline - Scenario of severe weather affecting flight from San Diego, CA to DFW and specific idiosyncrasies of airline airborne replanning for aircraft equipped and not equipped with ACARS

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Package Carrier - Scenario of severe weather affecting flight from San Diego, CA to DFW

Context for Scenarios
All of the flights originate in the western portion of North America with the intention of
landing in the Dallas-Ft. Worth area. A bad weather situation develops west of DFW,
　
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