Debug: Log aircraft target airport and movement state name

src/aircraft.h

@@ -145,4 +145,6 @@ void GetRotorImage(const Aircraft *v, EngineImageType image_type, VehicleSpriteS
 Station *GetTargetAirportIfValid(const Aircraft *v);
 void HandleMissingAircraftOrders(Aircraft *v);
 
+const char *AirportMovementStateToString(byte state);
+
 #endif /* AIRCRAFT_H */

src/aircraft_cmd.cpp

@@ -2303,3 +2303,37 @@ void UpdateAirplanesOnNewStation(const Station *st)
 	/* Heliports don't have a hangar. Invalidate all go to hangar orders from all aircraft. */
 	if (!st->airport.HasHangar()) RemoveOrderFromAllVehicles(OT_GOTO_DEPOT, st->index, true);
 }
+
+const char *AirportMovementStateToString(byte state)
+{
+#define AMS(s) case s: return #s;
+	switch (state) {
+		AMS(TO_ALL)
+		AMS(HANGAR)
+		AMS(TERM1)
+		AMS(TERM2)
+		AMS(TERM3)
+		AMS(TERM4)
+		AMS(TERM5)
+		AMS(TERM6)
+		AMS(HELIPAD1)
+		AMS(HELIPAD2)
+		AMS(TAKEOFF)
+		AMS(STARTTAKEOFF)
+		AMS(ENDTAKEOFF)
+		AMS(HELITAKEOFF)
+		AMS(FLYING)
+		AMS(LANDING)
+		AMS(ENDLANDING)
+		AMS(HELILANDING)
+		AMS(HELIENDLANDING)
+		AMS(TERM7)
+		AMS(TERM8)
+		AMS(HELIPAD3)
+		AMS(TERMGROUP)
+
+		default:
+			return "???";
+	}
+#undef AMS
+}

src/table/newgrf_debug_data.h

@@ -343,9 +343,15 @@ class NIHVehicle : public NIHelper {
 		}
 		if (v->type == VEH_AIRCRAFT) {
 			const Aircraft *a = Aircraft::From(v);
-			seprintf(buffer, lastof(buffer), "  Pos: %u, prev pos: %u, state: %u, flags: 0x%X",
-					a->pos, a->previous_pos, a->state, a->flags);
+			b = buffer + seprintf(buffer, lastof(buffer), "  Pos: %u, prev pos: %u, state: %u",
+					a->pos, a->previous_pos, a->state);
+			if (a->IsPrimaryVehicle()) b += seprintf(b, lastof(buffer), " (%s)", AirportMovementStateToString(a->state));
+			b += seprintf(b, lastof(buffer), ", flags: 0x%X", a->flags);
 			output.print(buffer);
+			if (BaseStation::IsValidID(a->targetairport)) {
+				seprintf(buffer, lastof(buffer), "  Target airport: %u, %s", a->targetairport, BaseStation::Get(a->targetairport)->GetCachedName());
+				output.print(buffer);
+			}
 		}
 
 		seprintf(buffer, lastof(buffer), "  Cached sprite bounds: (%d, %d) to (%d, %d), offs: (%d, %d)",