Motivation & Challenges

Global challenges

Global warming & impact of aviation on climate change:

Demographic growth (people)


7.6 billion


9.8 billion

Air traffic (passengers)


4.5 billion


16 billion

To support air mobility while mitigating the causes of climate change (reduce CO2 and other gas emissions), the industry and airliners have the following leverage

Aircraft efficiency

Alternative fuels/ propulsion

reducing of CO2/NOx emissions

Use more efficient flight maneuvers along optimized trajectories

In publications of ICAO, it is mentioned several times that a change in operations should not be driven by specific technologies. It should be driven by specific needs, in the present case by the need to reduce the environmental impact.

Scientific challenges

great Scientific challenges

GreAT will thrive to address the following:

  • Investigation of new possibilities to reduce gas emissions produced by aircrafts on flight trajectories
  • Local: Arrival / Departure routes, Delay absorption, Short Haul flights
  • Global: Traffic as a whole, Long Haul flights
  • New concepts to manage air traffic in a ‚greener‘ way, e.g. by using Trajectory Based Operations (TBO) and adapted airspace design
  • Determination of the potential to save gas emissions with greener trajectories