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Slot Hold Flag Issue

Slot Hold Flag Issue. A&D Meeting April 18, 2001 Rick Oiesen, Volpe Center. Meaning of the Slot Hold Flag. The Slot Hold Flag allows an airline to control whether a particular open slot will be included in the next compression. If the Slot Hold Flag for an open slot is set

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Slot Hold Flag Issue

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  1. Slot Hold Flag Issue A&D Meeting April 18, 2001 Rick Oiesen, Volpe Center

  2. Meaning of the Slot Hold Flag • The Slot Hold Flag allows an airline to control whether a particular open slot will be included in the next compression. • If the Slot Hold Flag for an open slot is set • That slot will not be included in the next compression, i.e.,it is held. (This gives an airline more time to decide what to do with the open slot.) • The slot hold flag for that slot will be cleared after the next compression. • If the the Slot Hold Flag for an open slot is not set, i.e., cleared • That slot will be included in the next compression, i.e., it is released.

  3. The Issue:How Should the Slot Hold Flag be Set by Default? • At CDM meetings in the past, we discussed the issue of how the slot hold flag should be set for ETMS cancels, e.g., time out cancels, host cancels. • The group’s decision, which was embodied in ETMS 7.2, was that when a flight is cancelled, the hold flag is set by default as follows. • For an airline cancel, the slot is released. (In the FX message, the airline can explicitly hold the slot.) • For an ETMS cancel, the slot is held. • This raises questions. • Consider a GA flight that files a flight plan, gets a slot, then cancels its flight plan; this slot is held. Should it be? • Should slot hold logic be specific to user type (e.g., GA, non-participants, those who don’t sub)? • Should we reconsider the defaults?

  4. Telcon • Held a telcon to discuss issues. • Two conclusions: • The ETMS 7.2 software would be deployed as is. • We would discuss this at the next A&D meeting to get a consensus on the long-term desired behavior.

  5. Options • Only set the Hold flag for an ETMS cancel if the flight belongs to a CDM participant. • Only set the hold flag for an ETMS cancel if the flight belongs to an airline that does subs. • Never set the hold flag for ETMS cancels 3.a. As a corollary to 3, have ETMS send a message to the airline whenever ETMS cancels a flight. Ken’s opinion: Option 3 treats all users the same, probably yields the fewest unused slots, and is easiest to implement.

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