Releasing a GS into an Initial GDP

Is the current approach the right choice?

Current procedure for issuing a GDP out of a FSM-issued GS

– Non-GS flights are exempt by Time +45

– GS flights are exempt by Status

• GS flights that are not airborne WILL be included

• Receive additional delay from the GDP

Note: This analysis does not represent the effects of releasing a GS into a GDP revision.

ORD 8/1/2000 Example1st Tier GS into an All + Canada GDP

Current Method:Exempt flights by Time +45, GS flights by Status

• Exempt all non-GS flights by Time +45 and GS flights by Status– High number of exemptions

• Queue 1: Exempt flights – All airborne flights and all non-GS flights departing w/in 45 minutes

• Queue 2: Previously controlled – 1st Tier GS flights

• Queue 3: Newly Controlled– All non-exempt, non-GS flights in program hours

Current Method:Exempt flights by

Time +45, GS flights by Status

Demand

After the GDP

Note there are no holes in delivery.

Alternative 1: Exempt all flights by Time +45

• Releases GS flights – May generate excess demand due to large number of exempt flights

– May lead to under-delivery in later program hours

– High number of exempt flights for the GS flights with which to compete

• Queue 1: Exempt flights – Airborne flights and all flights departing within 45 minutes, including GS

flights

• Queue 2: Previously controlled – (empty)

• Queue 3: Newly controlled– All non-exempt departing outside of 45 minutes

Alternative 1:Exempt all flights by

Time +45

Demand

After the GDP

Note the hole in the 1900 due to the high number of exemptions.

Alternative 2: Exempt all flights by Status

• Exempt departures and GS flights by Status– Currently used only for releasing non-FSM GS

– Includes all flights that are not airborne reducing number of exempt flights

• Queue 1: Exempt flights – Airborne flights

• Queue 2: Previously controlled – 1st Tier GS flights

• Queue 3: Newly controlled– All non-exempt, non-GS flights in program hours

Alternative 2:Exempt all flights

by Status

Demand

After the GDP

Note there are no holes in delivery.

Exemption Options - Delays

Options Queue # Flights Total Delay (min.) Ave. Delay per Flight (min.)exempt 245 944 3.9

prev. controlled 26 1698 65.3newly controlled 351 16722 47.6Total 622 19364 31.1exempt 271 1420 5.2

prev. controlled 0* - -newly controlled 351 16722 47.6Total 622 18142 29.1exempt 181 792 4.4

prev. controlled 26 192 7.4newly controlled 415 17002 40.9Total 622 17986 28.9

Time+45, GS flights by Status

All flights by Time+45

All flights by Status

* The GS flights are exempt from the GDP.

Exemption Options - The Pros and Cons

Time +45, GS by Status All by Time +45 All by Status

Pros -Exempts some flights by Time +45 -Exempts all flights by Time +45 -Reduces program’s total delay -Good for delivery -Reduces GS flights’ total delay -Reduces GS flights’ total delay

-Good for delivery

Cons -Increased delay for the GS flights -Holes in the program’s delivery -Only airborne exemptions-Increased total program delay -Increased total program delay

Conclusions

• Exempting flights by Status in this program proves to be the optimal method. It decreased the delay of the GS flights, decreased the total delay of the transition, and did not adversely effect the delivery of the program.

• A negative aspect of the exempt all flights by Status method is that flights within the Time +45 interval were given additional delay. However, that delay was less than the delay GS flights received in the exempt flight by Time +45 ,GS flights by Status method.

• The holes generated in the later program hours by the exempt all flights by Time +45 option were a result of the high number of exemptions.

• Note - This analysis does not represent the effects of releasing a GS into a GDP revision.