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Editorial
Joseph P. Hupy and Mary M. Fink

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Model-Based Evaluation of Energy Systems for Multirotor UAV Based on Batteries and Fuel Cells
Mika Suwe, Martje Eigenseer, and Claudia Werner

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COVID-19: Visualized Qualitative Aviation Research Themes
Chien-tsung Lu and Huabo Sun

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Public Acceptance of Guidance and Regulations for Space Flight Participation
Cory Trunkhill, Robert Joslin, and Joseph Keebler

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A Literary Survey on the Challenges of Adopting Lean in Aerospace Production and Aviation Maintenance
Seanan C. Lee

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A New Empirical Law for the Prediction of the Zero-Lift Pitching Moment Coefficient of Swept and Tapered Wings
Mondher Yahyaoui