An elegant synchronicity (top) captured last month at Valais in Switzerland by Olivier Staiger. To wit:
The contrail would normally appear white, but the large volume of air toward the setting Sun preferentially knocks away blue light, giving the reflected trail a bright red hue. Far in the distance, well behind the plane, is a crescent Moon, also slightly reddened….the featured image was taken so soon after sunset that planes in the sky were still in sunlight, as were their contrails.