The most efficient way to keep air quality at its peak is to reduce the number of people flying.
However, if the demand for air-cooling is high, the airlines have to be extra careful.
In the past, the biggest challenge faced by airlines was keeping their air conditioners running at optimum temperatures.
Now, there are many innovations to keep the air conditioner cool at low temperatures.
Some airlines use fans to cool the air, while others have fans designed to keep cold air from getting in.
And some airlines have installed fans in the cabin to cool passengers who are sleeping.
These coolers have a huge advantage: They keep cold and hot air at bay.
That is because they can keep cold-air flows at bay for longer periods of time.