What hours does O'Hare Airport operate?

O'Hare Airport operates 24 hours a day, which means that flights and airport services are available around the clock. This is essential for accommodating travelers arriving from different time zones, as well as providing flexibility for airlines that schedule flights at various times throughout the day and night. The continuous operation ensures that passengers can check in, go through security, and access amenities regardless of their flight times, making it a crucial aspect of modern airport functionality. Other options suggest restricted hours, which do not apply to O'Hare, as it serves as a major hub for domestic and international travel.