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The Netaji Subhas Chandra Bose International Airport has started the implementation of CAT III-B Instrument Landing System (ILS) from Thursday, that will allow flights to operate till the visibility drops below 50 metres. "NSCBI Airport, Kolkata has become the fifth airport after Delhi, Jaipur, Lucknowand Amritsar to be equipped with CAT III-B ILS. The implementation of ILS CAT III-B will be a big boon for the airports worst affected by fog during winter when the visibility goes as low as 50 metres," a statement said.