The service sector’s contributed to the economic sector as increasing the mobility of the people through air transportation services. Each airline strives to provide safety, customer satisfaction, and On Time Performance (OTP) because of the utilization tends to increase every year. OTP is the comparisons percentage value of actual time with scheduled time when flight activities are carried out. Large gaps indicate cancel/delay which can be caused by various factors such as lack of time in preflight preparation, aircraft handling, crewing, and others. The lack of preflight preparation time caused by  nonoptimal scheduling  ( many flight schedules or inefficiencies  plotting time on activity). The delayed time on handling aircraft one of which  caused by the  inability of airline to optimize maintenance activity such as inability to find problems quickly (corrective maintenance that is less than optimal) or the length of preparation due to preventive maintenance. The method of determining sample in this study’s  simple random sampling with total sample of 92 crew/staff. Data collection is done by observation, interviews, and questionnaires with data analysis technique namely Moderated Regression Analysis (MRA). The result can concluded, scheduling has a positive effect on OTP which was then able to be moderated by maintenance. Keywords: scheduling, on time performance, maintenance.