The B99, Bx99, and M99 bus routes formed a temporary night bus service in the New York City boroughs of Manhattan, Brooklyn, and the Bronx. The three bus routes were created to replace overnight subway service during the height of COVID-19 pandemic, while the subway system was closed to the public between 1:00 AM and 5:00 AM. All three routes overlapped in Manhattan allowing customers to easily transfer between services.