U.S., Jan. 16 -- Two airports may not be enough for a major city in India. Delhi and Mumbai are planning to have three major airports operating by 2040

At least 31 cities in India will have two airports by 2040 according to a vision document released by the ministry of civil aviation on Tuesday.

The report released at Global Aviation Summit in Mumbai says most of the large Indian airports are expected to be saturated over the next 10-15 years.

Hindustan Times had on November 1 reported that at least 20 cities in India would require a second airport by 2030, quoting the initial findings of a study by the civil aviation ministry.

"In leading regions like Delhi and Mumbai even the second airports are likely to be saturated by 2040 and wi...