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Listed below are all documents and RMI.org site pages related to this topic.
Transportation - Fossil fuel reduction opportunities - airplanes 3 Items

Reinventing Fire airplane efficiency improvements

http://www.rmi.org/RFGraph-RF_airplane_efficiency_improvements
Our airplane efficiency gain is derived from studies of new airplane designs within each of the major airplane size classes: narrowbody, widebody, and regional. Efficiency gains for each future airplane design are relative to existing 2010 designs.

 

Fuel efficiency gains since the modern jet age

http://www.rmi.org/RFGraph-fuel_efficiency_gains_modern_jet_age
Decades of improvements in airplane efficiency, logistics, and load factor slashed the fuel burned per seat by 82% during 1958–2010. Compared to early airliners like the Comet 4, engine fuel consumption has dropped by nearly 50%.

 

Seat miles demand outlook with Reinventing Fire technology portfolio

http://www.rmi.org/RFGraph-Seat_miles_demand_outlook_with_technology_portfolio
Considering historical technology adoption in aviation and entry into service dates for advanced airplanes, the majority of today’s planes could be replaced with more efficient versions by 2050.