the particular time that a program is broadcast or scheduled for broadcast: The airtime for the newscast is 10 p.m.
the time during which a broadcast takes place: The airtime for the new show is from 10 to 10:30 p.m.
a block of such time sold by a radio or television station to an advertiser, allotted to a political candidate, etc.: The company bought three minutes of airtime.
Also, air time.

1940–45; air1 + time Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To airtime
World English Dictionary
airtime (ˈɛəˌtaɪm)
1.  the time allocated to a particular programme, item, topic, or type of material on radio or television
2.  the time of the start of a radio or television broadcast

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
And they keep banging that drum because it gets them airtime, whether they're
  right or not.
State television has begun giving airtime to opposition figures even as it
  still disparages them.
Subscribers there do not want to spend much on airtime, but are keen to buy a
  flashy phone.
The rate of airtime exchanging hands based on a relatively few large top-ups
  seemed an anomaly.
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