The prevailing ATC concept of “first come, first served” had the drawback of queuing aircraft at the arrival route entries just before the end of the night ban at Zurich Airport. GREENER WAVE attempted to improve the situation by assigning a 4D slot prior to starting the approaches of all SWISS aircraft in the early-morning arrival wave. As a result of its overall success, the principles of GREENER WAVE remain operational. A total of 1700 flight trials were part of the evaluation.

Number of trials: 1700

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