More from Steve Redick:

Hank Sajovic shared the fire alarm office extra alarm tab and box card with us for the 5-11 Alarm at O’Hare Field 3/9/63. It looks like the companies due on the 5-11 never went to work, look at the times. A friend who was on 56 that day says all 5-11 companies were held up as he recalls.
Steve
Chicago Fire Department history, 5-11 Alarm fire at O'Hare Field March 9, 1963
 
Chicago Fire Department history, 5-11 Alarm fire at O'Hare Field March 9, 1963
 
Chicago Fire Department history, 5-11 Alarm fire at O'Hare Field March 9, 1963
 
Chicago Fire Department history, 5-11 Alarm fire at O'Hare Field March 9, 1963