1. Sierra Club staff (accessed 2015 January 28). “Request for Strong Clean Air Act Standards to Curb Aircraft Greenhouse Gas Emissions.” Sierra Club.2. Atkin, Emily (2015 January 22). “Environmental Groups Are Teaming Up To Make The EPA Regulate Airplane Emissions.” Climate Progress.

3. Abel, David et al. (2014 May 29). “Lung illnesses more likely near Logan Airport.” The Boston Globe.