Final answer:
Without specific data on Delta's reduction in layover time, it is impossible to answer the percentage reduction compared to the original 60-minute duration. Accurate answers require exact figures, which are not provided in the question.
Step-by-step explanation:
The question does not provide specific information on the percentage by which Delta cut the average time for a plane layover through the use of effective Gantt chart logistics and other tactics, so it is not possible to answer this directly. However, given the context that the original average layover duration was 60 minutes, any reduction in time would be calculated as a percentage of that one-hour timeframe. Reductions in layover time can significantly impact the efficiency of airline operations and improve the customer experience. The value of time savings for air travelers, particularly in the business sector, is substantial, with estimates placing the average price of time at $20 per hour. The opportunity costs of waiting in airports, including layover times, represent an essential factor for airlines and passengers alike.
To provide you with an accurate answer, I would need the specific percentage figure that Delta achieved in reducing the layover time.