Why isn't Delhi airport better prepared for fog, an age-old problem?

The fog phenomenon isn't new. Aviation consultant Mark Martin says that it's 'unfathomable' that Delhi airport, with four runways, has only one with CAT 3B and CAT 3C landing technology that helps land in low visibility. He joins Manu Balachandran to talk about who should be held accountable for the ongoing chaos, why the government needs to step in, and how the airports can get their priorities right