Analysis of Aircraft Turnaround Time based on Domestic Flight Operation Data

This study analyzes the key factors behind improvements in domestic on-time performance following the strengthening of delay management standards in 2023 and the introduction of the Route-Specific Scheduled Block Time Guideline in 2024. Analysis of operational data from 2023–2025 shows that delay mitigation resulted from domestic capacity adjustments driven by expanded international operations and more realistic scheduled flight times. In particular, extended block times on Gimpo-origin routes reduced delay risk, while turnaround time (TAT) remained largely unchanged before and after implementation. Consequently, actual TAT exceeded planned values at all analyzed airports, indicating that additional flight-time buffers were insufficient to absorb ground-operation variability. Future on-time performance policies should therefore integrate schedule optimization with airport-specific TAT alignment.