The commercial operations mainframes were located on the 2nd floor of Building 11 at Miami International Airport, just to the north of Building 16, Eastern's corporate headquarters. Commercial Operations was totally separated from the System One computer operation located out by the Doral Country Club. I worked there from August to October 1973 as a computer operations trainee working in the tape library, on the midnight shift with Tuesdays and Wednesdays off. Thankfully the OPEC fuel crisis somehow caused 17 of us to get laid off in Computer Operations (hundreds of others in other departments) and soured my long-standing interest on airline employment. I was recalled by Eastern the following March on the first day of my new employment with the Aviation Department at MIA and I declined the recall, one of the smartest moves I ever made.