Collaborative Decision Making
Promoting Information Exchange
and Collaboration
Collaborative Decision Making
CDM is a joint FAA/Industry initiative
aimed at improving Traffic Flow
Management through increased information
exchange and improved collaboration.
1
Collaborative Decision Making
• Moves away from centralized control by the
FAA and its agencies
• Moves towards distributed traffic
management
CDM Initiatives
• Ground Delay Programs Enhancements
• Collaborative Routing
2
Ground Delay Programs
• Controlled Time of Arrival (CTA)
• Slots allocated per hour = hourly arrival
capacity of the airport.
• Controlled Time of Departure (CTD)
CDM Building Blocks
• “Common situational awareness”
• Accurate and timely picture of demand
• Processes and procedures that are flexible
enough to permit efficient response to
changing conditions
• Decision support tools
3
Common Situational Awareness
Flight Schedule Monitor (FSM)
Graph Display of Airport Capacity vs. Demand
www.metsci.com/faa/faa.html
FSM Timeline Display of Flights
Accurate and timely Picture of Demand
• Technology infrastructure - CDMnet
• Remove disincentives to providing schedule
updates
4
CDMnet
AWE (FSM)
AAL (FSM)
COA (FSM)
ATCSCC
DAL (FSM)
NWA (FSM)
CDMnet
Schedule
Updates
Volpe
ADLs
SWA (FSM)
Metron (FSM)
TWA (FSM)
NAS
Data
OAG
Data
USA (FSM)
www.metsci.com/faa/faa.html
GDP Procedures Discouraged
Information Exchange and Collaboration
• Grover-Jack Algorithm
– Allocates slots based Estimated Time of Arrival
(ETA) when GDP is issued.
– Double Penalty discourages airlines from
notifying FAA about airline delays.
– Does not allocate slots to canceled flights.
5
Processes and Procedures
• Ration By Schedule (RBS)
• Compression
• Revisions
Ration By Schedule (RBS)
• Assigns slots based on original scheduled
(OAG) times rather than estimated time of
arrival.
• Eliminates double penalty
• Allocates slots to canceled flights.
6
Compression
• Compression is a inter-airline slot swapping
process which moves flights up into open
arrival slots so that valuable resources do
not go unused.
Revisions
• Allows the traffic management specialists to
change the number of slots allocated per
hour when the airport acceptance rates
change significantly due to unforeseen
weather fluctuations during the ground
delay program.
7
GDP Process
ATCSCC/AOC
Evaluation Demand Vs.
Capacity
Run GDP
( RBS Algorithm)
Send Proposed GDP
Advisory
AOC Response
(Substitutions &
Cancellations)
GDP Revision
/Extension
(RBS)
Compression
AOC Response
(cancellations)
Is GDP
still
required?
Yes
Exit loop when
program
expires or is
cancelled.
No
End
Compression Demo
8
Future Work
• GDP Enhancements
–
–
–
–
Simplified Subs
CTA control only
Incorporating Departures
Integration of CDM with Existing and
Developing Systems (CTAS, SMA)
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