These are the aircraft that Nepal Airlines uses for its international flights. They consist of Airbus A320 and Airbus A330.
9N-AKW
Name: Sagarmatha
Aircraft Type: Airbus A320-233(WL)
Operation start year: 2015
Production site: Hamburg (Germany)
Engine Model: 2x IAE V2527E-A5

9N-AKX
Name: Lumbini
Aircraft Type: Airbus A320-233(WL)
Operation start year: 2015
Production site: Hamburg (Germany)
Engine Model: 2x IAE V2527E-A5

9N-ALY
Name: Annapurna
Aircraft Type: Airbus A330-243
Operation start year: 2018
Production site: Hamburg (Germany)
Engine Model: 2x RR Trent 772B-60

9N-ALZ
Name: Makalu
Aircraft Type: Airbus A330-243
Operation start year: 2018
Production site: Hamburg (Germany)
Engine Model: 2x RR Trent 772B-60

Source: https://www.planespotters.net/airline/Nepal-Airlines
Updated: January, 2023