Cornell has a robust system of details on booking Charter Buses and Limosines here: | Cornell University Division of Financial Services
Please note, excerpt from the page above:
Vendor Selection
EHS and Procurement Serivces must approve vendors, and vendors must meet proof of insurance requirements. When making travel arrangements with a charter bus or limousine service, allow time for the aproval process, especially for international travel, which requires additional coordination with Global Operations.
When selecting a provider for transporting nine or more passengers in vehicles not operated by Cornell drivers, refer to EHS's Passenger Transport Compliance Data Sheet. The list is limited to recently used companies that have already been reviewed for compliance.