Originally Posted by shdw

It is irrelevant except for it means large jet aircraft that likely use bleed air systems, not boots or heated surfaces. A bleed air system can be metered to distribute more air to one area than another, even heated systems can be set to produce more heat. Whether or not they are is what I am curious about. Boots on the other hand have no real method for adjustment, they expand, they contract.

See what I mean?