**THE TWENTY-NINTH MEETING OF THE**

**INFORMAL PACIFIC ATC CO-ORDINATING GROUP**

**(IPACG/29)**

(Fukuoka, Japan, 28-31 October 2008)

Agenda Item 5: Air Traffic Management (ATM) issues

**DARP combined with UPR Routing in Central Pacific**

(Presented by IATA)

**[SUMMARY]{.underline}**

United Airlines conducted a DARP (Dynamic Air Re-route Procedure) on
September 21, 2008 between Tokyo and Honolulu of a User Preferred Route
(UPR). This information paper is for the information of the members of
IPACG/29 and illustrates the potential benefits of both DARP and UPR
operations in Pacific airspace.

1.  **Introduction**

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1.  Dynamic Air Re-route Procedures provides an operator with the
    opportunity to improve the efficiency of a flight while en-route
    utilizing the latest upper air wind data and taking into
    consideration any improved routings that may become available after
    departure.

2.  User Preferred Routes (UPR) trials have been conducted between Japan
    and Hawaii since August 2008. Combined with the opportunity to DARP
    while en-route, greater operational efficiency is achieved.

3.  Combining both UPR routing and DARP operations can have a
    significant affect on the operational efficiency of a flight as
    illustrated in the completion of UAL880 from Tokyo to Honolulu on
    September 21, 2008.

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2.  **Discussion**

    1.  On September 21, 2008 United Airlines operated flight UAL880
        from Tokyo RJAA to Honolulu PHNL via a UPR. When compared to
        PACOTS Track 11, the projected savings of the UPR route was
        one (1) minute and 300 pounds of fuel. This would also save 900
        pounds of CO2.

    2.  ![](media/image1.png){width="6.5in"
        height="4.802083333333333in"}The UPR routing was generated by
        United Airlines Dispatch and included airspace restrictions in
        the Hawaii region, including the UPR trial requirement to cross
        a named waypoint on the Honolulu Control facility boundary.

    3.  The DARP operation was initiated prior to 180E with a routing to
        30N170W, which provided the flight with the opportunity to
        tactically improve the routing into the Honolulu Control
        Facility. This resulted in a more direct routing and additional
        fuel savings.

    4.  Even though the DARP routing indicated zero time savings and
        only 69 pounds of fuel savings on "paper," actual saving
        amounted to 7 minutes less flight time and 2000 pounds of fuel
        saved.

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    5.  See the attached illustration of route comparisons.

3.  **Recommendation**

    1.  The meeting is invited to:

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a.  Note the information contained within this paper

b.  ANSPs are asked to consider both the expansion of User Preferred
    Routes and DARP operations in their airspace.

Attachment A

              CITYPAIR COMPARISON

UAL880 -1, 21SEP08, NRT-HNL B777-200ER

RTNG VIA OPTI-PAC11-SEALS-DANNO

F350 DCT GUPPY OTR13 SEALS DCT 36N150E DCT

37N160E DCT 36N170E DCT 33N180E DCT 29N170W DCT DANNO

DCT BOOKE BOOKE8

DIST 3376 TRIPF 101232 EET 6.39

COST FUEL 51605 TIME 5648 OVRFLT 948 TOTAL 58201

RTNG VIA OPTI-UPR-RIPKI W188

F350 DCT GUPPY OTR8 KAGIS OTR11 RIPKI DCT

37N155E DCT 37N160E DCT 36N170E DCT 34N180E DCT 29N170W

DCT ECEDO DCT DANNO DCT LIH V15 BOOKE BOOKE8

DIST 3382 TRIPF 100922  EET 6.38

COST FUEL 51449 TIME 5638 OVRFLT 948 TOTAL 58035

RTNG VIA PROPOSED DARP..DO NOT FILE

F350 DCT GUPPY OTR8 KAGIS OTR11 RIPKI DCT

37N155E DCT 37N160E DCT 36N170E DCT 34N180E DCT 30N170W

DCT DANNO DCT LIH V15 BOOKE BOOKE8

DIST 3382 TRIPF 100853  EET  6.38

COST FUEL 51415 TIME 5634 OVRFLT 948 TOTAL 57997

![](media/image2.jpeg){width="8.947916666666666in"
height="3.3958333333333335in"}