## 5 Examples of Scheduling Optimization of Apron Support Vehicles
As can be seen from Table 5, the utilization rate of the refueling truck before and after optimization is 100%. However, the utilization rate of the optimized oxygenated car and power car has been greatly improved. Specifically, the utilization rate of the oxygenated car has increased from 66.7% to 100% and that of power car 1 and 2 has increased from 28.6% to 40% and from 20% to 54.5%, respectively. Therefore, scheduling optimization improves the equipment resource utilization of oxygen vehicles and power vehicles to a certain extent, shortens the waiting time, and reduces the waste of guaranteed resources. At the same time, the completion time of the three tasks after optimization is 60 min, that is, 40 min less than the 100 min before optimization. 3. Optimization of vehicle operation scheduling supported by 5 aircraft  
For the 5-aircraft support, 2 refueling trucks and 2 power supply trucks protect 2 aircraft and 3 aircraft, respectively. According to the sequence of refueling \(\rightarrow\) oxygenation \(\rightarrow\) charging, the 5-aircraft support operations are completed in turn. Figure 4c shows that the population _fitness_ value is stable at 90 min, and the population average value is stable at 117 min. The population _fitness_ value changed after 45 iterations. In order to ensure that the population _fitness_ value did not change after 50 iterations, it was repeated 100 times, and the result did not change, and it can ensure the applicability of 50 iterations to 5-aircraft support. It can be seen from Table 5 that the utilization rate of refueling truck 1 before and after optimization is 100%, and that of refueling truck 2 after optimization is reduced from 100% to 66.7%. However, the utilization rate of the oxygenation refilling truck and power van has been greatly improved. The utilization rate of the oxygenation refilling truck and the power van 1 has increased from 71.4% to 88.23% and from 35.3% to 50%, respectively. Furthermore, the utilization rate of power van 2 has increased from 17.4% to 100%. Therefore, scheduling optimization improves the equipment resource utilization rate of the oxygenation refilling truck and power van to a certain extent. However, the utilization rate of refueling vehicle 2 decreases. The most important thing is that the three jobs were completed within 90 min after optimization, which is 25 min, that is, less than 115 min before optimization. 4. Optimization of vehicle operation scheduling guaranteed by 6 aircraft  
For the 6-aircraft support, each refueling truck and power van protects 2 aircraft and completes the 6-aircraft support operation in the sequence of refueling \(\rightarrow\) oxygenation charging. Figure 4d shows that the population _fitness_ value is stable at 90 min, and the population average value is stable at 118 min. As can be seen from Table 5, the utilization rate of the top 3 refueling trucks is 100%. After optimization, the utilization rate of refueling trucks decreases slightly. Specifically, the rates of refueling truck 1 and 2 drop to 66.7%, and that of refueling truck 3 drops to 85.7%. However, the utilization rate of the optimized oxygenation car and power van has increased significantly, and the utilization rate of the oxygenation car and the power van has increased from 75% to 100%; specifically, the utilization rate of power van 1 and 2 has increased from 28.6% to 100% and from 20% to 100%, respectively. Moreover, the rate of power van 3 has increased from 15.4% to 100%. At the same time, the total time of the three tasks after scheduling optimization is 90 min, which is 40 min shorter than the previous 130 min. For single-aircraft and dual-aircraft vehicle scheduling operations, the optimal scheduling method is as described above with the results shown in Table 6.  
Except for 1-2 aircraft, the operation scheduling of 3-6 aircraft has been improved to varying degrees, the support time has been shortened to varying degrees, and the utilization rate of support vehicles has been significantly improved.