TO enable aircraft to compete with other forms of transport, on a commercial basis, it is essential that services should be run during the hours of darkness. With this end in view the development of night flying facilities has received considerable attention in recent years, and it has been conclusively proved that, when multi‐engined machines are flown over an adequately lighted airway, night flying is both safe and reliable. In the United States, where aircraft are extensively used for carrying mails, more than 15,000 miles are flown every night under all conditions of weather.
Toulmin Smith, A.K. and Green, H.N. (1930), "Marking the Modern Air Route: The Lighting of Civil Air Routes and Aerodromes for Night Flying Considered in the Light of Modern Development", Aircraft Engineering and Aerospace Technology, Vol. 2 No. 1, pp. 11-15. https://doi.org/10.1108/eb029224
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