I feel like when I look up, 9/10 time there’s going to be a trail behind the plane, but if I go on a flight I never see it happen. Is it a specialty plane or something?
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They are [contrails](https://en.m.wikipedia.org/wiki/Contrail) or mostly ice crystals formed around impurities and water vapor (from jet exhaust).
[Why Don’t All Planes Leave Smoke Trails?](https://www.mentalfloss.com/article/23644/why-dont-all-planes-leave-smoke-trails). Edit: temperature and humidity mostly.
[Chemtrail conspiracy theory](https://en.m.wikipedia.org/wiki/Chemtrail_conspiracy_theory): or maybe someone is spraying chemical or biological agents from planes…
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