Victoria Williams, Robert Noland, Centre for Transport Studies, Imperial College London, London, United Kingdom
Comparing the climate impacts of long- and short-haul air travel (assigned to theme
This paper considers the relative climate impacts of long haul and short haul air travel. This is particularly important in the context of changing markets for air travel. New competing aircraft technologies will enhance competition between the hub and spoke model of aircraft operations and that of smaller aircraft operating direct routes for long haul trips. The relative environmental impacts of short and long haul flight is also relevant to the substitution of shorter trips by high-speed rail as this may free otherwise constrained airport capacity for additional long haul flights.
Previous comparisons have focused on fuel consumption per passenger kilometre, so long haul trips, where a much higher proportion of the journey is in the relatively efficient cruise phase, are more efficient than shorter trips. This study considers the additional role of contrails, believed to be important for the net climate impact of aviation. Short aircraft trips tend not to reach the very high altitudes attained by long haul cruising aircraft and so encounter different atmospheric conditions and have different probabilities of contrail formation. By including consideration of the variability in contrail formation conditions throughout the year, estimates of the linear contrail produced along various aircraft trajectories are obtained.
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