The correct answer is A. 1 aircraft per hour.
The gate utilization factor is the percentage of time that a gate is occupied by an aircraft. In this case, the gate utilization factor is 0.5, which means that the gate is occupied for 0.5 hours for every hour that it is available. The weighted average gate occupancy time is 30 minutes, which means that the average aircraft stays at the gate for 30 minutes.
To calculate the capacity of the gate, we need to divide the available time by the average occupancy time. The available time is 1 hour minus the gate utilization factor, which is 1 hour – 0.5 hours = 0.5 hours. The average occupancy time is 30 minutes, which is 0.5 hours. Therefore, the capacity of the gate is 0.5 hours / 0.5 hours = 1 aircraft per hour.
Option B is incorrect because it is twice the capacity of the gate. Option C is incorrect because it is the number of gates, not the capacity of each gate. Option D is incorrect because it is much higher than the capacity of the gate.