During the VVIP Movement, no flights will be allowed to take-off or land. During this time the airport will be completely closed due to the security reason for VVIP flight. Airport NOTAM office will declare NOTAM while the Order of precedence of Nepal will be traveling by airway using airport facility.

Source : https://www.aviationnepal.com/tribhuvan-international-airport-declares-notam-to-secure-vvip-flights-movement