Passengers flying into Heathrow in fog or poor visibility will be guided in using a new microwave-based system. The existing Instrument Landing System (ILS) is susceptible to interference, meaning aircraft had to be spaced further apart on their final approach. The new Microwave Landing System (MLS) is less prone to interference, meaning aircraft can now land at a faster rate. Initially, the system will be used by British Airways' Airbus 320s, although other airlines are expected to follow. (source: news.bbc.co.uk)
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