https://www.airfleetrating.com/airport/what-terminal-is-spirit-at-slc-airport/

VivaAerobus Las Vegas terminal is located at Terminal 3 of McCarran International Airport. This terminal offers a range of amenities including dining options, shopping areas, and comfortable seating. Passengers flying with VivaAerobus can enjoy easy access to check-in counters and security checkpoints, ensuring a smooth travel experience.