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