b.
When an ARTCC is holding the optimum number of aircraft, the adjacent ARTCCs will be issued quotas concerning aircraft which can be cleared into the impacted ARTCC airspace. When the adjacent center's demand exceeds the quota, aircraft will be held in the adjacent ARTCC's airspace until they can be permitted to proceed.

c.
The size of the hourly quota will be based initially on the projected acceptance rate and thereafter on the actual landing and diversion totals. Once quotas have been imposed, departures in the arrival and adjacent ARTCC's area to the affected airport may

be assigned ground delay, if necessary, to limit airborne holding to ATC capacity. However, when a forecast of improved acceptance rate appears reliable, in the opinion of the arrival ARTCC, additional above quota flights may be approved based on the expectation that by the time these additional above quota flights become an operational factor in the affected area, the system will be able to absorb them without undue difficulty.
d.
Long distance flights, which originate beyond the adjacent ARTCC area, will normally be permitted to proceed to a point just short of the arrival ARTCC boundary where a delay, at least equal to the delays (ground/airborne) being encountered will be assigned.

e.
ARTCCs imposing ground delays make efforts to advise the users when lengthy delays are a prospect to preclude unnecessary boarding and subsequent unloading prior to actual take-off due to lengthy unanticipated ground delays. Users should advise the ARTCC through FSS or operation offices when there is any significant change in the proposed departure time so as to permit more efficient flow control planning. Airborne aircraft holding in the adjacent ARTCC airspace generally receive more benefit than ground delayed aircraft when increases unexpectedly develop in the quota number because the reaction time is less. For this reason, whenever operationally feasible, adjacent ARTCCs may offer airborne delay within their areas instead of ground delay.

f.
Flights originating beyond the adjacent ARTCC areas may not have sufficient fuel to absorb the total anticipated delay while airborne. Accordingly, the concerned adjacent ARTCC may permit these flights to land in its area while retaining previously accumulated delay for the purpose of quota priority. When the amount of air traffic backlogging in an adjacent ARTCC area is approaching the saturation point, additional enroute traffic will be subject to prior approval.

g.
 Generally, movement of arrival aircraft into the impacted airport terminal area will be made on the basis that those flights with the most accumulated delay, either ground, airborne, or a combination of both, normally receive priority over other traffic. This applies only to delays encountered because of the situation at the airport of intended landing.

h.
Pilots/operators are advised to check for flow control advisories which are transmitted to Flight Service Stations, to selected airline dispatch offices and ARTCCs.
　
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