1. During the 1970s television was on the air between thirty-five and forty hours a week. BNC
2. While the programme was still on the air, one of the BBC staff, Rob Frost, was telephoning the army's Adventure Training Unit in London. BNC
3. On the hour the news and weather and we'd like to hear from you this afternoon Nottingham three four three four three four the number to ring if you'd like to have a chat on the air. BNC