The MTA began operating Prevost X3-45 buses in 2011, when it acquired 90 buses of this type. This marked the first time that the MTA purchased coach buses from a company other than MCI for its express services. Since the initial order in 2011, the MTA purchased an additional 300 Prevost X3-45 buses in 2015 and placed an order for an additional 307 buses of the same type at the end of 2019 that are due to enter service in 2021.