diff --git a/validate_yaml.py b/validate_yaml.py
index 44b9925..d23fd0e 100755
--- a/validate_yaml.py
+++ b/validate_yaml.py
@@ -2,12 +2,15 @@
 """Load YAML data to ensure validity."""
 
 import os
+import typing
 from datetime import date, timedelta
 
+import agenda
 import agenda.conference
 import agenda.data
 import agenda.travel
 import agenda.trip
+import agenda.types
 
 config = __import__("config.default", fromlist=[""])
 
@@ -35,3 +38,18 @@ next_year = today + timedelta(days=2 * 365)
 
 events = agenda.events_yaml.read(data_dir, last_year, next_year)
 print(len(events), "events")
+
+airports = typing.cast(
+    dict[str, agenda.types.StrDict], agenda.travel.parse_yaml("airports", data_dir)
+)
+print(len(airports), "airports")
+for airport in airports.values():
+    assert "country" in airport
+    assert agenda.get_country(airport["country"])
+
+
+stations = agenda.travel.parse_yaml("stations", data_dir)
+print(len(stations), "stations")
+for station in stations:
+    assert "country" in station
+    assert agenda.get_country(station["country"])