Trav Talk. Mumbai International Airport (MIAL) plans to begin demolishing Terminal 1 in April 2027 and complete its replacement by December 2030. The redevelopment is expected to increase the airport’s. Mumbai, Oct 3 (PTI) Adani Airports will begin a phased redevelopment of the ageing Terminal 1 at Mumbai airport from January 2027, starting with the North Section of Terminal 1B, citing safety.