How did patrol patterns and poor air-traffic control contribute to the surprise?
Short answerIncoming flights created uncertainty, but basic radio checks and an organized command-and-control system could have distinguished them from an attack.
NotesUncertainty about friendly traffic and the arriving B-17s was manageable. Simple radio identification or an alert pair of fighters could have checked an incoming formation. Hawaii possessed radar, radios, fighters, observers, and patrol aircraft, but these pieces had not been integrated into a reliable control organization. Operators familiar with radar returns reportedly recognized that the contact did not resemble the expected B-17 flight, while senior command lacked the experience needed to understand that distinction. Information existed without a practiced process for identification, warning, and interception. A near-identical exercise on 23 December used the SCR-270 network and a control centre to intercept a simulated raid 25 miles from Pearl Harbor, a belated demonstration of what the unfinished system could do.