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Benefits of ERTA Submission

Benefits of ERTA Submission. CDM Meeting 18 April 2001 Dennis Gallus Michelle Venanzi Chris Ermatinger. Purpose of Briefing. Follow-up 25 Jan A & D meeting: What good does the ERTA field do for the user community? Approach: Historical analysis: Summary: Who’s using

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Benefits of ERTA Submission

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  1. Benefits of ERTA Submission CDM Meeting 18 April 2001 Dennis Gallus Michelle Venanzi Chris Ermatinger

  2. Purpose of Briefing • Follow-up 25 Jan A & D meeting: What good does the ERTA field do for the user community? • Approach: • Historical analysis: • Summary: Who’s using • Data: Fewer missed CTDs • Theoretical: ERTA in FSM algorithms

  3. Who’s using ERTA • 4 “Majors” submitting ERTA data; 3 dominate the data • In Jan 01, had ERTA data for • 40-50% of controlled flights to LGA • 70-80% of controlled flights to ORD • 50-60% of controlled flights to SFO

  4. Question: Did submitting ERTA ensure that an achievable CTD was assigned? • Examined all LGA and SFO GDPs, Jan-Mar 01; all ORD GDPs Jan 01 • Compared ERTA vs. non-ERTA flights • Looked for flights that missed CTDs by more than 15 minutes

  5. Effect of ERTA on CTD compliance--LGA Overall, 15 % of the flights with ERTA missed CTD by 16+ min. (18%, 16%, 13% for Majors 1, 2, 3)

  6. Effect of ERTA on CTD compliance--ORD Overall, 11% of the flights with ERTA missed CTD by 16+ min. (11%, 11%, 20% for Majors 1, 2, 3)

  7. Effect of ERTA on CTD compliance--SFO Overall, 11 % of the flights with ERTA missed CTD by 16+ min. (6%, 13%, 11% for Majors 1, 2, 3)

  8. Result • It appears that flights with associated ERTA got departure times that they could meet • Compliance results varied by day and by airline

  9. ERTA use RBS Compression ‘-’ Delay If ERTA is null, then BETA is used Definitions ERTA Earliest runway time of arrival BETA ETA when the initial GDP is modeled LRTA Airline runway time of arrival FSM Algorithms

  10. Inside RBS ETE 1500 1800 1900 1930 time GDP BETD/CTD IGTA-taxi BETA/CTA ASLOT

  11. Inside Compression (RBS++) ETE 1500 1800 1900 1930 time GDP BETD/CTD IGTA-taxi BETA/CTA ASLOT

  12. Inside Pure Compression ETE 1545 1800 1820 1900 1930 1950 time Compression BETD/CTD Airline runway time of departure/ Earliest runway time of departure IGTA-taxi BETA/CTA Airline runway time of arrival/ Earliest runway time of arrival ASLOT Note that FSM 1.8.1 will use IGTA-taxi as the lower bound for compression, not BETA

  13. Inside ‘ - ’ Delay ETE 1615 1800 1820 1900 1930 1950 time time - Delay BETD/CTD Airline runway time of departure/ Earliest runway time of departure IGTA-taxi BETA/CTA Airline runway time of arrival/ Earliest runway time of arrival ASLOT

  14. Conclusions • More airlines are submitting ERTA • Flights with without ERTA data have a higher probability of missing the assigned CTD • Algorithmically, the odds of obtaining achievable slots favor flights with ERTA

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