While EPA estimates that aircraft contribute 11 percent of the GHG emissions within the U.S. transportation sector – 3 percent of total U.S. emissions – significant growth in the sector is expected. By 2035, aircraft emissions likely will increase by almost 50 percent. EPA’s proposal would cover smaller aircraft such as the Cessna Citation CJ2+ up to the largest jet aircraft – the Airbus A380 and Boeing 747. (Military aircraft are excluded.)
Renewable fuels will play an expanding role in GHG reductions. Currently, cost and availability limit widespread use. Performance, however, is well documented, in commercial flights and in the Navy’s Green Fleet program.