diff --git a/aman/types/Inbound.py b/aman/types/Inbound.py
index 6c3173a..7b3aafe 100644
--- a/aman/types/Inbound.py
+++ b/aman/types/Inbound.py
@@ -37,6 +37,12 @@ class Inbound:
         self.PlannedRunway = None
         self.PlannedStar = None
         self.ArrivalCandidates = {}
+        self.WTC = None
+
+        # analyze the WTC
+        wtc = report.aircraft.wtc.upper()
+        if 'L' == wtc or 'M' == wtc or 'H' == wtc or 'J' == wtc:
+            self.WTC = wtc
 
         # search performance data -> fallback to A320
         if self.Report.aircraft.type in performanceData.Aircrafts: