extend the schedule time

AircraftSchedule.proto

@@ -8,4 +8,5 @@ message AircraftSchedule {
     string   arrivalRoute      = 2; // planned arrival route
     string   arrivalRunway     = 3; // planned arrival runway
     string   reachIafAtTime    = 4; // UTC time when the aircraft needs to pass IAF
+    string   reachRunwayAtTime = 5; // UTC time when the aircraft needs to touch down
 }