American Airlines SABRE System (1964)

• 40,000 passenger reservations per day

• 3 second average response time

• 2100 inputs per minute

• 31,000 miles of leased lines

• Programmed in machine language

• • 500,000 lines of code

• Ran on dual IBM 7090 mainframes

• • 64K core memory (RAM)
  • 700 MB of disk space, 115 millisecond average seek