With around 75 per cent of its air cargo getting cleared in less than 48 hours, Delhi has emerged the fastest among metros, according to the time-tracking colour dashboard recently launched by the Central Board of Indirect Taxes & Customs (CBIC). In Mumbai, about a fourth of the air cargo takes more than 72 hours to get cleared, and only 45 per cent gets done in less than 48 hours, the dashboard — blinking red, amber and green — has shown. Delhi blinked green.