Chhatrapati Shivaji Maharaj International Airport (CSMIA) in Mumbai, India, will shut down both its primary runway (09/27) and secondary runway (14/32) from 11:00 AM to 5:00 PM on Thursday for essential pre-monsoon maintenance. This unusual simultaneous closure at one of the world's busiest airports, which handles over 1,000 air traffic movements daily, is aimed at performing necessary repairs, including rubber removal and drainage cleaning. Major airlines such as Emirates, British Airways, and Air India have responded by rescheduling flights and rerouting passengers to alternative airports in Pune, Ahmedabad, and Goa. Emirates has rebooked affected travelers to earlier slots, while British Airways adjusted outbound flights to ensure timely departures before the closure. Air India has modified its domestic schedules to maintain international connections, and other carriers like Lufthansa and Singapore Airlines are offering flexible rescheduling options and additional customer support. Despite the runway shutdown, airport terminals will remain operational, with services expected to resume after a mandatory safety inspection at 5:00 PM.