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. 2022 Apr 8;16:739866. doi: 10.3389/fnhum.2022.739866

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Copyright © 2022 Zhong, Goh, Woo and Alam.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Figure showing (A) the boundaries of an air traffic control (ATC) sector (colored in yellow) covering the airspace in the southeastern region of Singapore island generated using Google Earth and (B) the aircraft number recorded on a randomly selected 24-h working day in 2019 before COVID-19 outbreak. Descriptive statistics are shown on the top left corner; SD, Standard Deviation; Min., Minimum; Max., Maximum.