What should you do if you find a bag of mail?

When you find a bag of mail, the correct action is to notify both City Operations and the Post Office. This approach ensures that the situation is appropriately handled according to proper protocol. City Operations may have specific procedures for handling lost or found mail, ensuring that security and safety measures are followed. Notifying the Post Office is equally important, as they are the authority responsible for the mail and can take the necessary steps to recover it or investigate the situation. This coordinated notification helps to ensure that the mail is processed and returned to its intended recipients efficiently, while also maintaining security standards at O'Hare Airport.

Other options may suggest taking the bag yourself or leaving it where it is, which could lead to potential security risks or complications in handling the mail correctly.