SP Plus Corp. provides professional parking, ground transportation, facility maintenance, security, event logistics, and baggage handling and related services to commercial, institutional, municipal and aviation clients. It also provides a wide range of event logistics services. The firm operates through the following segments: Commercial, Aviation, and Other. The Commercial segment encompasses services in healthcare facilities, municipalities including meter revenue collection and enforcement services, government facilities, hotels, commercial real estate, residential communities, retail, colleges and universities, as well as ancillary services. The Aviation segment encompasses services in aviation, as well as ancillary services, which include shuttle and ground transportation services, valet services, baggage handling, baggage repair and replacement, remote air check-in services, wheelchair assist services and other services. The company was founded in 1929 and is headquartered in Chicago, IL.