Delhi's airspace will experience daily closures for approximately two-and-a-half hours between January 21 and January 26 for Republic Day rehearsals and celebrations. These restrictions, announced via a Notice to Airmen (NOTAM), are expected to impact over 600 flights daily, causing delays, cancellations, and rescheduling for thousands of passengers. Airlines are working to adjust schedules, with passengers advised to check for updates and potential refunds. The closures are a standard security measure for the event.