Boeing and Airbus signed an agreement to work together to ensure global interoperability in air-traffic management as part of an effort to help reduce the impact of aviation on the environment. The companies will seek the acceleration of improvements to the world’s air-transportation management system in order to increase efficiency and eliminate traffic congestion. The initiative by Airbus and Boeing to work together to help the aviation sector and governments choose the most direct path to a modernized air-traffic management system is part of a three-pronged approach to help improve the environmental performance of aviation. The other two prongs are competition and support for industry alignment on environmental positions where appropriate. Improvements to the global air-transportation system that provide more efficient routing, better arrival management, and speed control will reduce inefficient delays and time in the air, which will save fuel and reduce emissions. Such air-traffic-management improvements represent the greatest short-term opportunities to reduce CO2 emissions.