The Indira Gandhi International Airport, managed by Delhi International Airport Limited, retained the world's number one position for the second consecutive year in '25-40 Million Passengers Per Annum (MPPA)' category. This ranking was announced by Airports Council International (ACI) in the '2015 Airport Service Quality (ASQ) Awards' on Monday. Officials said IGI is the only Indian airport to bag awards in all the three categories, including best airport by size and region—Asia Pacific. It had achieved the position of world's number 2, which it retained for three consecutive years till 2013. In 2014, it was ranked number 1 in the '25-40 MPPA' category and retained the rank in 2015.