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MIT ICATMIT ICAT
ATC System Response to Events of September 11, 2001
Jonathan Histon & Prof. R. John Hansman
JUP Meeting, October 10, 2001.
Gander Newfoundland:
Population September 10: ~ 10,000
Population September 11: ~ 16,000
MIT ICATMIT ICAT Timeline of Events
September 11, 2001 8:45 a.m.
AAL 11 strikes North Tower
9:03 a.m.UAL 175 strikes South Tower
9:17 a.m.FAA closes all NY Airports
9:40 a.m.FAA closes all Airspace
MIT ICATMIT ICAT NOTAM
FDC 1/9731 FDC SPECIAL NOTICE - DUE TO EXTRADORDINARY CIRCUMSTANCES AND FOR REASONS OF SAFETY.
ATTENTION ALL AIRCRAFT OPERATORS, BY ORDER OF THE FEDERAL AVATION COMMAND CENTER,
ALL AIRPORTS/AIRDROMES ARE NOT AUTHORIZED FOR LANDING AND TAKEOFF.
ALL TRAFFIC INCLUDING AIRBORNE AIRCRAFT ARE ENCOURAGE TO LAND SHORTLY.
MIT ICATMIT ICAT 10:00 a.m. ____
MIT ICATMIT ICAT System Shutdown Time
0
500
1000
1500
2000
2500
3000
3500
4000
4500
9:45 10:00 10:15 10:30 10:45 11:00 11:15 11:30
# o
f A
irp
lan
es
-3,331 Aircraft per Hour
2 Planes Over Continental U.S.A.
MIT ICATMIT ICAT Departure Time Distribution
9:53
0
10
20
30
40
50
60
70
8:00
:00
AM
8:10
:00
AM
8:20
:00
AM
8:30
:00
AM
8:40
:00
AM
8:50
:00
AM
9:00
:00
AM
9:10
:00
AM
9:20
:00
AM
9:30
:00
AM
9:40
:00
AM
9:50
:00
AM
# o
f A
irc
raft
9:53
Date (All)
Count of Aircraft ID
Dep Time
Time
“Official” FAA Shut Down of Airspace
Departure Time
MIT ICATMIT ICAT 10:00 a.m. --------------11:30 a.m.
MIT ICATMIT ICAT Halifax
Toronto, Ontario 24St. John's, Newfoundland 25Montreal, Quebec 27Gander, Newfoundland 37Vancouver, BC 44Halifax, Nova Scotia 45Total 270
MIT ICATMIT ICAT Timeline of Events (2)
Start-up September 12
Diverted flights completed. Repositioning flights allowed.
September 13 Airspace re-opened to commercial traffic (11:00 am)
September 14 General Aviation IFR Operations approved Parcel deliveries resume (UPS, FedEx)
September 15 Airspace re-opened to foreign aircraft.
September 16 Mail, parcels, other cargo allowed on commercial flights.
MIT ICATMIT ICAT
System Start-up: Thursday, September 13, 2001
MIT ICATMIT ICAT Gradual System Response
0
1000
2000
3000
4000
5000
6000
7000
0:00 4:00 8:00 12:00 16:00 20:00 0:00EDT Time
# o
f A
irc
raft
Thursday
Friday
Saturday
Monday
Tuesday
Pre-9/11Average
Airspace Reopened
MIT ICATMIT ICAT Summary
U.S. Airspace emptied in ~ 1 – 1.5 hours Rate of 3300 aircraft / hour.
Aircraft airborne counts reached previous levels in 6 days Large Jets still ~ 85% of all traffic. Traffic counts are inconsistent with some other data sources
OPSNET, ASPM report operations down 17-18%
Further research opportunities Ability to explore “undelayed” flight times.
MIT ICATMIT ICAT Complexity Metrics Update
Project: Develop understanding of cognitive complexity.
Recent development: Capability to capture real traffic flows relative to sector shapes:
Example Boston ARTCC, Utica Sector
Westbound flows from New England to Cleveland ARTCC Controls FL180+
Sample Data October 5, 2001 4 p.m 8 p.m.
MIT ICATMIT ICAT Complexity Metrics Update
Traffic flow through “Utica” Sector (Friday October, 5th 4 p.m. 8 p.m.)
2950
2970
2990
3010
3030
3050
3070
3090
-3960 -3940 -3920 -3900 -3880 -3860 -3840 -3820 -3800 -3780