The flight planning process is an extensive and long process to direct and maintain a high level of operations within the airspace. As air traffic demand grows year after year, it's worthwhile to optimise the European air traffic system further. One way of optimising the system, is by creating optimal flight schedules that solve for demand-capacity imbalances. These schedules require an evaluation with respect to punctuality and fuel consumption in the tactical phase. For this article, an air traffic model has been developed in BlueSky to simulate air traffic while taking the variance of wind and delay into account. Subsequently, the performance of several optimised schedules will be assessed and compared with respect to wind, speed changes, punctuality and fuel consumption.