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-rw-r--r--src/airport.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/airport.h b/src/airport.h
index d1cddba15..2aaddfbc1 100644
--- a/src/airport.h
+++ b/src/airport.h
@@ -39,6 +39,7 @@ enum {
AT_OILRIG = 9,
NEW_AIRPORT_OFFSET = 10,
NUM_AIRPORTS = 128,
+ AT_INVALID = 254,
AT_DUMMY = 255
};