New Delhi, June 25 -- Adani Airport plans to invest more than $2.1 billion ( Rs.20,000 crore) in the first phase of a large-scale airport city development programme spanning over 655 acres across six airports in five states, the Adani Airport City Ltd (AACL) announced on Thursday, as the ports-to-power conglomerate expands into non-aviation businesses.

The expansion will span the cities of Mumbai and its suburb of Navi Mumbai, Ahmedabad, Lucknow, Jaipur, and Guwahati, with around 22 million square feet of mixed-use infrastructure planned in the initial phase, Adani Airport Holdings Ltd. said in a statement Thursday.

The company said that these walkable urban districts will integrate hospitality, retail, entertainment, and commercial hub...