diff --git a/ogn_python/collect/celery.py b/ogn_python/collect/celery.py
index d940240..2e5928a 100644
--- a/ogn_python/collect/celery.py
+++ b/ogn_python/collect/celery.py
@@ -10,6 +10,8 @@ from ogn_python.collect.logbook import update_max_altitudes as logbook_update_ma
 from ogn_python.collect.database import import_ddb as device_infos_import_ddb
 from ogn_python.collect.database import update_country_code as receivers_update_country_code
 
+from ogn_python.collect.stats import create_device_stats, update_device_stats_jumps, create_receiver_stats, create_relation_stats, update_qualities
+
 from ogn_python import db
 from ogn_python import celery
 
@@ -69,4 +71,17 @@ def purge_old_data(max_hours):
         .filter(ReceiverBeacon.timestamp < min_timestamp) \
         .delete()
 
-    db.session.commit()
\ No newline at end of file
+    db.session.commit()
+
+
+@celery.task(name='update_stats')
+def update_stats(day_offset):
+    """Update stats of the current day."""
+
+    date = datetime.datetime.today() + datetime.timedelta(days=day_offset)
+
+    create_device_stats(session=db.session, date=date)
+    update_device_stats_jumps(session=db.session, date=date)
+    create_receiver_stats(session=db.session, date=date)
+    create_relation_stats(session=db.session, date=date)
+    update_qualities(session=db.session, date=date)
\ No newline at end of file
diff --git a/ogn_python/config/default.py b/ogn_python/config/default.py
index a7cc024..b991790 100644
--- a/ogn_python/config/default.py
+++ b/ogn_python/config/default.py
@@ -5,7 +5,7 @@ SQLALCHEMY_TRACK_MODIFICATIONS = False
 CELERY_BROKER_URL = 'redis://localhost:6379/0'
 CELERY_RESULT_BACKEND = 'redis://localhost:6379/0'
 
-
+from celery.schedules import crontab
 from datetime import timedelta
 
 CELERYBEAT_SCHEDULE = {
@@ -30,6 +30,16 @@ CELERYBEAT_SCHEDULE = {
         'task': 'update_logbook_max_altitude',
         'schedule': timedelta(minutes=1),
     },
+    'update-stats-hourly': {
+        'task': 'update_stats',
+        'schedule': timedelta(hours=1),
+        'kwargs': {'day_offset': 0},
+    },
+    'update-stats-daily': {
+        'task': 'update_stats',
+        'schedule': crontab(hour=0, minute=5),
+        'kwargs': {'day_offset': -1},
+    },
     #'purge_old_data': {
     #    'task': 'purge_old_data',
     #    'schedule': timedelta(minutes=10),
diff --git a/ogn_python/templates/airport_detail.html b/ogn_python/templates/airport_detail.html
index 7088b42..5ccf638 100644
--- a/ogn_python/templates/airport_detail.html
+++ b/ogn_python/templates/airport_detail.html
@@ -2,6 +2,8 @@
 
 {% block content %}
 
+<link rel="stylesheet" href="{{ url_for('static', filename='css/flags/flags.css') }}"/>
+
 <div class="container">
 
 <div class="panel panel-success">
diff --git a/ogn_python/templates/logbook.html b/ogn_python/templates/logbook.html
index 9908690..c844e49 100644
--- a/ogn_python/templates/logbook.html
+++ b/ogn_python/templates/logbook.html
@@ -47,7 +47,7 @@
 	<tr>
 		<td>{{ loop.index }}</td>
         <td><a href="{{ url_for('device_detail', id=entry.device.id) }}">{% if entry.device.info is none %}{{ entry.device.address }}{% else %}{{ entry.device.info.registration }}{% endif %}</a></td>
-        <td>{% if entry.device.info is none %}(?){% else %}{{ entry.device.info.aircraft }}{% endif %}</td>
+        <td>{% if entry.device.info is none %}-{% else %}{{ entry.device.info.aircraft }}{% endif %}</td>
         <td>{% if entry.takeoff_timestamp is not none and entry.takeoff_airport.id|string() == sel_airport %} {{ entry.takeoff_timestamp.strftime('%H:%M') }} {% endif %}</td>
         <td>{% if entry.takeoff_track is not none and entry.takeoff_airport.id|string() == sel_airport %} {{ '%02d' | format(entry.takeoff_track/10) }} {% endif %}</td>
         <td>{% if entry.landing_timestamp is not none and entry.landing_airport.id|string() == sel_airport %} {{ entry.landing_timestamp.strftime('%H:%M') }} {% endif %}</td>