At MIT, SAGE (Semi Automatic Ground Environment) was developed: a computerized system of 23 coordination centers, each with 50 operators and two redundant computers, capable of tracking the trajectory of 400 aircraft simultaneously; the system was only decommissioned in 1984. IBM, the main supplier of the Lincoln project, which gave birth to SAGE, used the experience gained in this way to create a real-time ticketing system for American Airlines.
