Question #8: Which is Greener? Flying during the day or during the night
Answer: Flying during the Day
Daytime flights have less than half the environmental impact of red-eyes. Contrails, those vapor trails that look like clouds, have at least as much negative impact on the climate as carbon dioxide airplane emissions. They’re formed by jet emissions and capture heat. During the day these contrails also reflect sunlight, so the impact is somewhat offset. At night, however, there’s no sunlight to reflect.