dep_delay_diff = dep_delay - dep_time_min + sched_dep_time_min
Should not it be dep_delay_diff = dep_delay - dep_time_min - sched_dep_time_min ?
dep_delay_diff = dep_delay - dep_time_min + sched_dep_time_min
Should not it be dep_delay_diff = dep_delay - dep_time_min - sched_dep_time_min ?