What unique program does O'Hare offer for fostering community involvement?

O'Hare Airport has a unique program that fosters community involvement through volunteering opportunities for local organizations. This initiative encourages local residents to participate actively in airport-related events and activities, helping to build a sense of community and strengthen the relationship between the airport and the surrounding area. By providing volunteers to support various programs and initiatives, O'Hare promotes civic engagement and enables individuals to contribute to the airport's operations, thus enhancing the overall experience for travelers and local residents alike.

While other choices may also have merit, they do not specifically focus on direct community engagement in the way that volunteering does. Initiatives like discounted parking, local art exhibitions, and public transportation subsidies serve their purposes but do not inherently promote active involvement in the community like the volunteering opportunities do. This distinguishes the correct answer as the most impactful in terms of fostering a collaborative relationship between O'Hare Airport and the local community.