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NM USER FORUM 2014. Flight Efficiency Opportunity generation A use case for the GRRT tool. Philippe Waroquiers NM Head of NeOs Team 30.01.2014. What is the GRRT tool?. GRRT = G roup R e R outing T ool A tool to change the route or propose routes for flights.

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Nm user forum 2014

NM USER FORUM 2014

Flight Efficiency Opportunity generationA use case for the GRRT tool

Philippe Waroquiers

NM Head of NeOs Team

30.01.2014


What is the grrt tool
What is the GRRT tool?

  • GRRT = Group ReRouting Tool

  • A tool to change the route or propose routes for flights


G roup r e r outing t ool where can we use it
Group ReRouting Tool : where can we use it ?

  • Flexible tool : used for multiple purposes and contexts

    • Strategical : e.g. prepare for an exceptional event

    • Pre-tactical : e.g. prepare PREDICTed traffic for the next days

    • Post-ops : e.g. study possible network improvements, produce KPIs, ...

    • Tactical : e.g. Flight Efficiency Opportunity generation

  • GRRT execution

    • under user control : “one shot, interactive”

    • unattended : “run it automatically, every day, at a certain time”

  • One use case is the Flight Efficiency Opportunity program:

    • the aircraft operator provides the information needed to setup (one or more) daily unattended automatic GRRT.


How is a grrt executed
How is a GRRT executed ?

  • Retrieve the Group of flights to reroute

  • For each flight, make a list of possible alternative routes

    • from automatically daily maintained route catalog (> 200_000 routes)

    • using the path finder : dynamic route generation

  • Compute the “cost” of each alternative route

    • “cost” is based on AO chosen cost criteria

      • e.g. route length, fuel, route charges, …

  • If a significantly cheaper route is found,

    • inform AO of the possible improvement:

      • Flight is marked as having an opportunity in CHMI/NOP flight list

      • Operational log contains the details : field 15, changes in route length, …


Flight efficiency grrt s registration info to be provided by ao
Flight Efficiency : GRRT(s) registration info(to be provided by AO)

  • When and how to select the Group of flights for this GRRT

    • When to run this GRRT e.g. 09h00

    • your AO list e.g. TCX CFG TCW VKG ART MYX

    • The take off time period e.g. from 11h00 till 17h00

  • Route generation uses standard criteria (route catalog, path finder)

  • Give your cost specific parameters to evaluate the route

    • Desired minimum (total) improvement

      • Example : -100 Euros reduction minimum needed

    • Detailed cost criteria

      • Example: 1 minute of delay = 40 Euros 1 ton of fuel = 850 Euros 1 minute flying time = 10 Euros


Cost criteria balancing by grrt
Cost criteria balancing by GRRT

  • GRRT automatically searches the route with the cheapest total cost

    • Cheapest opportunity might deteriorate some criteria :

      • deteriorate some criteria (e.g. ground delay, route length)but improve some others (e.g. flying time, fuel)ifin total it is more efficient (cheaper)

  • Example: 1 minute of delay = 40 Euros 1 NM = 20 Euros

  • + 5 minutes delay, -20 NM : cheaper +200 -400 = -200

  • + 5 minutes delay, -5 NM : more expensive +200 -100= +100

  • -15 minutes delay, +10 NM : cheaper -600 +200= -400

  • What if huge delay (e.g. strike):-200 minutes delay, +350 NM : cheaper -8000 +7000 =-1000

  • To avoid excessive balancing, specify a limit deterioration :1 NM = 20 Euros limit deterioration: 100 NM


Grrt dynamic route generation and evaluation
GRRT dynamic route generation and evaluation

  • Done using up to date information:

    • Last meteo information (wind)

    • Last minute opening (or closing) of routes

    • Based on current/detailed ATFCM situation (delays, closures)

  • => generate opportunities that allows to benefit

    • from a shorter route if the delay situation improves on this route

    • from a shorter route thanks to a last minute opening

    • from route that avoid severely regulated area

    • from better route efficiency (fuel, flying time) thanks to up to date wind


Grrt real operational case internal screen to input ao params
GRRT : real operational case (internal screen to input AO params)


Result similarly visible in chmi nop operational log
Result (similarly visible in CHMI/NOP operational log)

interesting route and its TOT validity

current route cost: 2943 (3043)(-100) + 0 + 496 + 0 + 2007 + 540

interesting cheapest route cost: 2800(0) + 0 + 452 + 0 + 1808 + 540

Other routes (less interesting and/or more expensive) followsordered by cost


Improvement in nm 18 0 flexible group flight selection in internal screen to input ao params
Improvement in NM 18.0 : flexible Group Flight selection (in internal screen to input AO params)

  • Wildcards on any column of the GRRT Selection tab

  • Allows to have different GRRTs (and cost criteria)

    • Per aircraft type group e.g. for small/medium/big aircrafts

    • For some specific city pairs

    • For regulated flights or non regulated flights

    • For flights having a big delay

    • ….


Other improvements in nm 18 0
Other improvements in NM 18.0

  • Simplified oplog in CHMI/NOP

    • Only showing the current route and the interesting routes

      • (more expensive routes not shown)

    • Only showing the criteria values (e.g. NM, Kg, minutes, …)

      • (corresponding EUROs values not shown anymore)

  • Easier input of a GRRT to be executed several times per day


Grrt for flight efficiency opportunity summary
GRRT for Flight Efficiency opportunity: summary

  • Daily significant benefits (operational, environmental, …) reported by participating AOs

  • GRRT is a sophisticated/flexible/efficient tool

    • but it is complex

    • => we set it up for you !

  • Contact us to discuss your wishes/specific needs/…

    • We prepare and activate your set of GRRTs

    • They run automatically everyday for your benefit

      • Less fuel, less delay, shorter flying time, …

        Questions ?


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