diff --git a/src/economy.cpp b/src/economy.cpp
--- a/src/economy.cpp
+++ b/src/economy.cpp
@@ -471,6 +471,9 @@ void ChangeOwnershipOfCompanyItems(Owner
 		UpdateSignalsInBuffer();
 	}
 
+	/* Add airport infrastructure count of the old company to the new one. */
+	if (new_owner != INVALID_OWNER) Company::Get(new_owner)->infrastructure.airport += Company::Get(old_owner)->infrastructure.airport;
+
 	/* convert owner of stations (including deleted ones, but excluding buoys) */
 	Station *st;
 	FOR_ALL_STATIONS(st) {