the amount of time that is given to a particular subject on radio or television （广播或电视节目的）播放时间 Celebrities and politicians vie for prime-time television and radio airtime. 名人和政客争夺黄金时段电视和广播时间。 They are calling for more airtime for jazz. 他们呼吁为爵士乐提供更多播放时间。
the amount of time that is paid for when you are using a mobile phone 空中通话时长（移动电话计费的通话时间） This deal gives you 180 minutes free airtime a month. 这项协议允许你每月免费通话 180 分钟。