Page last updated at 07:31 GMT, Wednesday, 25 March 2009

How microwaves are helping planes land

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Passengers flying into Heathrow airport in fog or poor visibility will now be guided in using a new microwave 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.

The BBC's Transport correspondent Tom Symonds explains, with the help of Captain Tim Price, a British Airways pilot.

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