Dear Colleagues,

Increased demand on flight efficiency and the possibility of free route airspaces and trajectory-based operations require a different perspective on flight performance calculations covering the new possibilities. Although the description of a 4D aircraft trajectory and the solution of its set of non-linear differential equations of motion has been focused on since the 1960s, several solutions have been found for the reduction in the degrees of freedom to the necessary minimum. Other models include empirical parameters which are difficult to improve. However, the increasing number of optimization target functions and the potential to increase fuel efficiency, although already at the top of the possible maximum, require a rethinking of flight performance calculations—a challenge that many scientists feel up to. This leads to necessary reconsiderations of already proved approaches.

This Special Issue serves as a forum for discussion and further development of new approaches and ideas for improving flight performance estimates by adding information and therefore moving closer to efficient flight performance.

Dr. Judith Rosenow
Dr. Michael Schultz
Guest Editors

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