1) American business magazine 2) Breathing passages 3) Vents 1) Bronchi 
In most cases, aircraft, especially airliners, cannot simply fly from one point directly to another. Rather, they must follow designated airways. Airways are an invisible three-dimensional network of roads that zigzag within controlled airspace. Sometimes called corridors, most are nine miles (14 ki...
The tubes (pipes) that make up the respiratory system.
the passageways that air moves through while travelling in and out of the lungs during breathing