The Chicago O’Hare International Airport consistently remains one of the busiest air terminals in the world with more than 65 million passengers and nearly 900,000 flights annually. Direct communication and interoperability among various departments, organizations, federal agencies, and emergency services throughout the airport is critical to ensure the safety and security of the traveling public. However, being able to notify, assemble, and deploy the proper responders to emergency situations in the most efficient and effective manner possible presents several challenges.