Blocks 1A and 1B were used to handle international operations while domestic operations took place in 1C. The old domestic airport ( Palam) is known as Terminal 1 and was divided into separate buildings - 1A, 1B, and 1C. With the inauguration of this new international terminal, Terminal 2, on, the airport was renamed as Indira Gandhi International Airport (IGIA). Owing to an increase in air traffic in the 70s and the 80's, an additional terminal with nearly four times the area of the old Palam terminal was constructed. In 1979–80, a total of 3 million domestic and international passengers flew into and out of Palam Airport. Palam Airport had a peak capacity of around 1,300 passengers per hour.