slot credit by liaoxiuli

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									Slot Credit Substitutions

       Basic Concepts
       and why it is a
 Desirable Public Policy Goal
   CDM A&D Sub Group Meeting - April 18, 2001
                  Presented by
         Roger Beatty - American Airlines
           System Operations Control
If an airport arrival rate is constrained we
can adjust demand by:
• Delay flights over time to used capacity that is
  available later in the day
• Cancel flights and reaccommodate passengers
• Combinations of both delay and cancel options
• NOTE: The delay option is available to both the
  airlines and ATCSCC. The “Cancel and
  reaccommodate” is an airline only option and
  can be encouraged or discourage by incentive
             P-DELAY = #PSGR X min DLYD                   Passengers
Passengers

                                                           0 CNX
    60


                                                       176 (60 late)
   116


    93                                                          93



    87                                                          87


                                                                87
    87

                                           P-Delay min =3600


TTL 443                                   Original P-Delay is
             P-Delay min = 26580
                                    738% geater then revised
                   ORIGINAL LGA GDP DELAYS - 18 flights


            1400


            1200


            1000
DELAY MIN




            800                                           ARVL DLY
                                                          DPTR DLY
            600                                           TOTAL DLY


            400


            200


              0
                         NUMBER OF FLIGHTS
                   LGA GDP DELAYS AFTER 1 CANCELLATION AND REORDERED
                                      ARRIVAL SLOTS

            1400


            1200


            1000
DELAY MIN




            800                                                    ARVL DLY
                                                                   DPTR DLY
            600                                                    TOTAL DLY

            400


            200


              0
                                 NUMBER OF FLIGHTS
                                           ORIGINAL LGA GDP DELAYS - 18 flights

            1400




            1200




            1000




            800
DELAY MIN




                                                                                                         ARVL DLY
                                                                                                         DPTR DLY
                                                                                                         TOTAL DLY
            600




            400




            200




              0
                   1   2   3   4   5   6      7   8    9    10   11   12   13   14   15   16   17   18
                                                  NUMBER OF FLIGHTS
                       LGA GDP DELAYS AFTER 1 CANCELLATION AND REORDERED ARRIVAL SLOTS

            1400




            1200



            1000
DELAY MIN




            800
                                                                                                      ARVL DLY
                                                                                                      DPTR DLY
                                                                                                      TOTAL DLY
            600




            400



            200




              0
                   1   2   3   4   5   6   7      8    9   10      11   12   13   14   15   16   17
                                               NUMBER OF FLIGHTS
             P-DELAY = #PSGR X min DLYD              Passengers
Passengers
                        Moved 5 min
    60


   116
                                            MISSED
    93


    87
                                          HOW CAN WE
                                          BRIDGE THE GAP
    87
                                          AND ALLOW
                                          GOOD THINGS TO
                                          HAPPEN

TTL 443
             P-Delay min = 26580
SLOT CREDIT SUBSTITUTIONS (SCS)
WOULD ALLOW:
• Participants to submit a SCS if the slot
  released was of greater value (earlier) then
  the one requested (later)
• One or more other flights that were available
  for compression to have their delay reduced
  to bridge the gap caused by the SCS
• For flights to wind up in “true” slots and the
  20 minute window would not be required
Parties Involved in
Slot Credit Substitutions:

• Operator requesting the SCS
• Operator(s) forming the delay
  reduction bridge for the SCS request
• ATCSCC software and personnel
  running the Ground Delay Program
The originator of the SCS cancellation
should be able to “see” if an SCS is:

• Required (If an normal sub would work
  why use a SCS?)
• Possible (Are their flights available to
  form the delay reduction bridge)
• Acceptable (Will ETMS/FSM process
  the request successfully and the desired
  delay reduction results be achieved)
The operators forming the
compression bridge should:
• Have their flights that requested earlier
  CTAs receive appropriate delay
  reduction
• Be notified of EDCT/CTA changes in a
  timely and convenient manner
• Have minimal disruption to normal slot
  swapping activities
ATCSCC should perceive SCS as a way
to fulfill desirable policy goals:

• It encourages cancellations and
  decreases passenger delays
• Provides better passenger delivery rate
• Reduces ATCSCC work load as part of
  the need to compress GDPs would be
  accomplished through the SCS process
• Will not lead to greater data instability
    Slot Credit Substitution
  (SCS) is a Powerful Concept
• It provides a frame work for better inter-
  airline slot utilization
• Allows for better airline and ATCSCC
  distributed decision making
• Could significantly reduce passenger
  delays
• The question should not be IF we should
  do SCS but HOW we should do it and how
  quickly can we get it done

								
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