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It's for the ATIS Updated Information
Airports broadcast a short blurb of information on current operations (including weather conditions, wind speed direction, closed runways/taxiways, etc.) on a frequency that pilots listen to on approach. Everytime the report is updated, it is given the next letter designation in the phonetic alphabet. ATC is just ensuring the inbound pilots are aware of the most up-to-date information.
http://www.lerc.nasa.gov/WWW/MAEL/ag/atis.htm
Last edited by FlyinHawaiian; Sep 24, 2005 at 11:55 am