air transportation

:  breath

:  the mixture of invisible odorless tasteless gases (such as nitrogen and oxygen) that surrounds the earth

:  a light breeze

:  to expose to the air for drying, purifying, or refreshing :  ventilate

:  to expose to public view or bring to public notice

:  to transmit by radio or television

:  an act, process, or instance of transporting or being transported

:  means of conveyance or travel from one place to another

:  public conveyance of passengers or goods especially as a commercial enterprise