You Must choose 3 suppliers

The flight was undertaken with the cooperation of coordination with providers of air navigation in seven countries. The flight was made green as the aircraft underwent special in-air and on-ground techniques that ended up reducing flight emissions enough to save more than five tonnes of CO2 compared to a flight operating under normal flight conditions.

The techniques used include flying the most direct and optimal route, reducing the number and length of on-ground delays, using ground power during delays, ensuring uninterrupted ascent and descent paths, and making use of preferential runways and expedient taxis.

See the original Google News article for more details.