1) Individual aircraft 2) Light in a night sky 3) Upper atmosphere light
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https://www.crosswordclues.com/clue/airglow
Airglow (also called nightglow) is the very weak emission of light by a planetary atmosphere. In the case of Earth`s atmosphere, this optical phenomenon causes the night sky never to be completely dark, even after the effects of starlight and diffused sunlight from the far side are removed. ==Development== We can compare this with `real` answer......
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http://en.wikipedia.org/wiki/Airglow
[aircraft] Airglow is a human powered aircraft. It was designed and developed by brothers John and Mark McIntyre of Cambridgeshire, England. ==Development== John McIntyre holds a marine engineering degree, and Mark McIntyre is a professional model-builder, both brothers were keen aero-modelers and had a history of building creative contrapt...
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http://en.wikipedia.org/wiki/Airglow_(aircraft)
The visible light that appears at night in the upper atmosphere.
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http://www.braeunig.us/space/glossary.htm
faint luminescence of the Earth`s upper atmosphere that is caused by air molecules` and atoms` selective absorption of solar ultraviolet and ... [1 related articles]
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http://www.britannica.com/eb/a-z/a/34
Diffuse radiation, extending from the near infrared to the far ultraviolet, that is continuously emitted by a planetary atmosphere; also known as nightglow. It is caused by the collision of charged particles and X-rays from space, mainly from the Sun, with atoms and molecules high in the atmosphere....
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http://www.daviddarling.info/encyclopedia/A/airglow.html
The faint background glow in the night sky caused by gas in the ionosphere. Because of airglow the night sky is never completely dark as seen from Earth's surface.
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http://www.encyclo.co.uk/local/20448
The natural glow of the night sky due to reactions that take place in the Earth's upper atmosphere.
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https://www.encyclo.co.uk/local/22784
a dim light from the upper atmosphere caused by emissions from atoms and molecules ionized by solar radiation: observed at nightduring the dayand at twilightwith each having slightly different characteristics.
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https://www.infoplease.com/dictionary/airglow
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