I heard that during the night, the density of the air is high due to lower temperatures. This seems to benefit the airliner in fuel cost. Is this true?
Yes, it is true that night flights are preferred by pilots and airliners due to the lower temperatures.
The density of the air at night is higher than during the day, which reduces drag on an aircraft and increases its efficiency.
This means that less fuel needs to be burned in order for a plane to reach its destination, resulting in cost savings for airlines.
Additionally, fewer planes are flying at night so there’s less congestion in airspace which can also help reduce delays or cancellations due to weather or other factors.