diff --git a/templates/trip/stats.html b/templates/trip/stats.html
index 7d81a3d..8a117ef 100644
--- a/templates/trip/stats.html
+++ b/templates/trip/stats.html
@@ -31,24 +31,20 @@
       {% endfor %}
       </div>
     <div>
-      Flight segments in {{ year }}: {{ year_stats.flight_count or 0 }}
-      {% if year_stats.airlines %}
+      Flight segments in {{ year }}: {{ year_stats.flight_count }}
       [ by airline:
-        {% for airline, count in year_stats.airlines.most_common() %}
-          {{ airline }}: {{ count }}{% if not loop.last %},{% endif %}
-        {% endfor %} ]
-      {% endif %}
+      {% for airline, count in year_stats.airlines.most_common() %}
+        {{ airline }}: {{ count }}{% if not loop.last %},{% endif %}
+      {% endfor %} ]
     </div>
-    <div>Trains segments in {{ year }}: {{ year_stats.train_count or 0 }}</div>
-    <div>Total distance in {{ year}}: {{ format_distance(year_stats.total_distance or 0) }}</div>
-    {% if year_stats.distances_by_transport_type %}
+    <div>Trains segments in {{ year }}: {{ year_stats.train_count }}</div>
+    <div>Total distance in {{ year}}: {{ format_distance(year_stats.total_distance) }}</div>
     {% for transport_type, distance in year_stats.distances_by_transport_type.items() %}
       <div>
         {{ transport_type | title }}
         distance: {{format_distance(distance) }}
       </div>
     {% endfor %}
-    {% endif %}
   {% endfor %}
 </div>
 {% endblock %}
diff --git a/validate_yaml.py b/validate_yaml.py
index 4e3ed1d..818840d 100755
--- a/validate_yaml.py
+++ b/validate_yaml.py
@@ -43,19 +43,13 @@ def check_trips() -> None:
 
 
 def check_flights(airlines: set[str]) -> None:
-    """Check flights and ensure they are in chronological order."""
+    """Check flights."""
     bookings = agenda.travel.parse_yaml("flights", data_dir)
-
-    prev_first_depart = None
     for booking in bookings:
         assert all(flight["airline"] in airlines for flight in booking["flights"])
-        check_currency(booking)
 
-        if prev_first_depart:
-            assert (
-                booking["flights"][0]["depart"] > prev_first_depart
-            ), "Bookings are not in chronological order by first flight's departure."
-        prev_first_depart = booking["flights"][0]["depart"]
+    for booking in bookings:
+        check_currency(booking)
 
     print(len(bookings), "flights")