This is the number of people who used IGI airport in Delhi last year

In a record boom, Delhi’s Indira Gandhi International (IGI) Airport becomes India’s only airport to cater to 5-crore passenger last year. Mumbai has come second in the list with 4.4 crore passengers.

IGI’s record of catering to this many people was 21% higher than 4.6 crore passengers IGI had handled in 2015.
Delhi airport has achieved this feat at a time when both domestic and international air travel peaked up, thanks to low oil prices, which enabled the airlines to offer tickets at cheap prices.

In 2016, as per record, 10 crore domestic passengers flew in India.

Successive Union governments have been talking of clearing a second airport for Delhi, but there has been no concrete move on that front, according to The Economic Times. The aviation ministry last year approved a revised master plan for IGIA under which it will get a bigger budget terminal; a new one and the fourth runway. However, nothing concrete has been planned yet.