Airlines contribute 3% of the European CO2 production. A lot of the fuel is wasted by airlines when they “zig-zag” between the air spaces of the European countries. In March 2009 European lawmakers have approved the Single European Sky II plan that will make air transport more sustainable through a reduction of the unnecessary trajects and will facilitate the European CO2 cutting objective in 2020 (i.e. 20 % down from the levels of 1990 emissions).
Prospective improvements are up to 10% per flight, which amounts to 16 million tons of CO2 savings per year and annual cost savings for
airspace users of B€ 2.4.