Table 14.

Selected US technology goal for aviation and environment (from Aeronautics Science and Technology Subcommittee, Committee on Technology, National Science and Technology Council, Anonymous, 2007).

Goal	Near term (<5 yr)	Mid-term (5–10 yr)	Far term (>10 yr)
Advance development of technologies and operations to enable significant increases in the energy efficiency of the aviation system	Enable fuel efficient N + 1 aircraft and engines (33% reduction in fuel burn compared with a B737/CFM56)	Enable fuel efficient N + 2 aircraft and engines (at least 40% reduction in fuel burn compared with a B737/CFM56)	Enable fuel efficient N + 3 aircraft and engines to reduce fuel burn by up to 70% compared with a B737/CFM56)
Advance development of technologies and operational procedures to decrease the significant environmental impacts of the aviation system	Enable cleaner N + 1 aircraft and engines; LTO NOx emissions reduction (70% below CAEP2 standard)	Enable cleaner N + 2 aircraft and engines; LTO NOx emissions reduction (80% below CAEP2 standard)	Enable cleaner N + 3 aircraft and engines; LTO NOx emissions reduction (better than 80% below CAEP2 standard)