Specifications include, but are not limited to: assist the Department with On-Call Aviation Planning Consulting Services as directed by the Department to meet the requirements of the two airports in the system (O’Hare and Midway International). This includes all services needed to coordinate the facility functions with the surrounding transportation infrastructure. ; Contractor to implement a staffing plan based on scalability, which is the idea of scaling staffing levels up and down for all positions as needed on a regular basis to perform the Services. In performing the Services, Contractor must cooperate fully with other City of Chicago departments; airport tenants, tenant operators, and tenant contractors; other governmental agencies operating at the Airports and/or having jurisdiction for issues which may involve the Airports; and other airport stakeholders at the discretion of the Department.