Hello everyone,
I have read that commercial aircrafts fly at a certain altitude for several reasons, with one of them being for "
economic" reason.
I would like to understand why. I know it has to do with the relationship between IAS & TAS, but not sure to grap correctly why.
My understanding :
As we fly higher, less air molecules will fly over the wings as density is decreasing.
To maintain our lift, we therefore need to increase our speed (so our TAS increase) to generate more air to flow over the wings.
But more TAS, wouldn't mean more thrust and therefore more fuel? I am definitely missing something here
Thanks in advance.