diff --git a/app/main/jinja_filters.py b/app/main/jinja_filters.py
index 18712f5..2fa3d3e 100644
--- a/app/main/jinja_filters.py
+++ b/app/main/jinja_filters.py
@@ -1,11 +1,26 @@
 from app.main import bp
-from app.model import Airport, Sender, Receiver
+from app.model import Airport, Country, Sender, Receiver
 
 from flask import url_for
 import datetime
 import math
 
 
+@bp.app_template_filter()
+def to_html_flag(obj):
+    if obj is None:
+        return ""
+
+    if isinstance(obj, str):
+        return f"""<img src="{url_for('static', filename='img/Transparent.gif')}" class="flag flag-{obj.lower()}" alt="{obj}"/>"""
+
+    elif isinstance(obj, Airport):
+        return f"""<img src="{url_for('static', filename='img/Transparent.gif')}" class="flag flag-{obj.country_code.lower()}" alt="{obj.country_code}"/>"""
+
+    elif isinstance(obj, Country):
+        return f"""<img src="{url_for('static', filename='img/Transparent.gif')}" class="flag flag-{obj.iso2.lower()}" alt="{obj.iso2}"/>"""
+
+
 @bp.app_template_filter()
 def to_html_link(obj):
     if isinstance(obj, Airport):
diff --git a/app/tasks/sql_tasks.py b/app/tasks/sql_tasks.py
index e116c9c..769a51e 100644
--- a/app/tasks/sql_tasks.py
+++ b/app/tasks/sql_tasks.py
@@ -135,8 +135,8 @@ def update_statistics(date_str=None):
     db.session.execute(f"""
         UPDATE receiver_rankings AS rr
         SET
-            longtime_global_rank_delta = rr.longtime_global_rank - sq.longtime_global_rank_yesterday,
-            longtime_local_rank_delta = rr.longtime_local_rank - sq.longtime_local_rank_yesterday
+            longtime_global_rank_delta = sq.longtime_global_rank_yesterday - rr.longtime_global_rank,
+            longtime_local_rank_delta = sq.longtime_local_rank_yesterday - rr.longtime_local_rank
         FROM (
             SELECT
                 rr.receiver_id,
diff --git a/app/templates/airport_detail.html b/app/templates/airport_detail.html
index dce27ca..c577b84 100644
--- a/app/templates/airport_detail.html
+++ b/app/templates/airport_detail.html
@@ -9,7 +9,7 @@
 <div class="panel panel-success">
 <div class="panel-heading"><h3 class="panel-title">Airport Details</h3></div>
 <table class="datatable table table-striped table-bordered">
-	<tr><td>Name:</td><td><img src="{{ url_for('static', filename='img/Transparent.gif') }}" class="flag flag-{{ airport.country_code|lower }}" alt="{{ airport.country_code }}"/> {{ airport.name }}</td></tr>
+	<tr><td>Name:</td><td>{{ airport|to_html_flag|safe }} {{ airport.name }}</td></tr>
 	<tr><td>Code:</td><td>{{ airport.code }}</td></tr>
 	<tr><td>Altitude:</td><td>{{ airport.altitude|int }} m</td></tr>
 	<tr><td>Style:</td><td>{{ airport.style }}</td></tr>
diff --git a/app/templates/airports.html b/app/templates/airports.html
index 939c535..f04cec6 100644
--- a/app/templates/airports.html
+++ b/app/templates/airports.html
@@ -31,7 +31,7 @@
     {% for airport in airports %}
 	<tr>
 	  <td>{{ loop.index }}
-    <td><img src="{{ url_for('static', filename='img/Transparent.gif') }}" class="flag flag-{{ sel_country|lower }}" alt="{{ sel_country }}"/></td>
+    <td>{{ sel_country|to_html_flag|safe }}</td>
     <td>{{ airport|to_html_link|safe }}</td>
 	  <td><a href="{{ url_for('main.logbooks', country=sel_country, airport_id=airport.id) }}">Logbook</a></td>
 	</tr>
diff --git a/app/templates/logbooks.html b/app/templates/logbooks.html
index 839f36d..c19777f 100644
--- a/app/templates/logbooks.html
+++ b/app/templates/logbooks.html
@@ -61,8 +61,8 @@
         <td>{% if entry.duration is not none %}{{ entry.duration }}{% endif %}</td>
         <td>{% if entry.max_altitude is not none %}{{ '%d' | format(entry.max_altitude - entry.takeoff_airport.altitude) }} m{% endif %}</td>
         <td>
-        	{% if entry.takeoff_airport is not none and entry.takeoff_airport.id != sel_airport_id %}Take Off: <img src="{{ url_for('static', filename='img/Transparent.gif') }}" class="flag flag-{{ entry.takeoff_airport.country_code|lower }}" alt="{{ entry.takeoff_airport.country_code }}"/> <a href="{{ url_for('main.logbooks', country=entry.takeoff_airport.country_code, airport_id=entry.takeoff_airport.id, date=sel_date) }}">{{ entry.takeoff_airport.name }}</a>
-	        {% elif entry.landing_airport is not none and entry.landing_airport.id != sel_airport_id %}Landing: <img src="{{ url_for('static', filename='img/Transparent.gif') }}" class="flag flag-{{ entry.landing_airport.country_code|lower }}" alt="{{ entry.landing_airport.country_code }}"/> <a href="{{ url_for('main.logbooks', country=entry.takeoff_airport.country_code, airport_id=entry.landing_airport.id, date=sel_date) }}">{{ entry.landing_airport.name }}</a>
+        	{% if entry.takeoff_airport is not none and entry.takeoff_airport.id != sel_airport_id %}Take Off: {{ entry.takeoff_airport|to_html_flag|safe }} <a href="{{ url_for('main.logbooks', country=entry.takeoff_airport.country_code, airport_id=entry.takeoff_airport.id, date=sel_date) }}">{{ entry.takeoff_airport.name }}</a>
+	        {% elif entry.landing_airport is not none and entry.landing_airport.id != sel_airport_id %}Landing: {{ entry.landing_airport|to_html_flag|safe }} <a href="{{ url_for('main.logbooks', country=entry.takeoff_airport.country_code, airport_id=entry.landing_airport.id, date=sel_date) }}">{{ entry.landing_airport.name }}</a>
 	        {% endif %}
 	    </td>
 	</tr>
diff --git a/app/templates/receiver_detail.html b/app/templates/receiver_detail.html
index 8a500e8..579bf08 100644
--- a/app/templates/receiver_detail.html
+++ b/app/templates/receiver_detail.html
@@ -10,9 +10,9 @@
 <div class="panel panel-success">
 <div class="panel-heading"><h3 class="panel-title">Receiver Details</h3></div>
 <table class="datatable table table-striped table-bordered">
-	<tr><td>Name:</td><td><img src="{{ url_for('static', filename='img/Transparent.gif') }}" class="flag flag-{{ receiver.country.iso2|lower }}" alt="{{ receiver.country.iso2 }}"/> {{ receiver.name }}</td></tr>
+	<tr><td>Name:</td><td>{{ receiver.country|to_html_flag|safe }} {{ receiver.name }}</td></tr>
 	<tr><td>Airport:</td>
-		<td>{% if receiver.airport is not none %}<img src="{{ url_for('static', filename='img/Transparent.gif') }}" class="flag flag-{{ receiver.airport.country_code|lower }}" alt="{{ receiver.airport.country_code }}"/>
+		<td>{% if receiver.airport is not none %}{{ receiver.airport|to_html_flag|safe }}
 			<a href="{{ url_for('main.airport_detail', airport_id=receiver.airport.id) }}">{{ receiver.airport.name }}</a>
 		{% else %}-{% endif %}
 		</td>
diff --git a/app/templates/receiver_ranking.html b/app/templates/receiver_ranking.html
index 94f2c26..22c8216 100644
--- a/app/templates/receiver_ranking.html
+++ b/app/templates/receiver_ranking.html
@@ -23,7 +23,7 @@
   <table id="myTable" class="table table-striped table-bordered tablesorter tablesorter-bootstrap">
     <thead>
       <tr>
-        <th class="text-right">Total</th>
+        <th class="text-right" colspan="2">Rank</th>
         <th class="text-right">Today</th>
         <th>Name</th>
         <th>Airport</th>
@@ -43,9 +43,10 @@
       {% set rank = entry.local_rank %}{% set longtime_rank = entry.longtime_local_rank %}{% set longtime_rank_delta = entry.longtime_local_rank_delta %}
     {% endif %}
       <tr>
-        <td class="text-right">{{ longtime_rank }} ({% if longtime_rank_delta is none or longtime_rank_delta == 0%}±0{% elif longtime_rank_delta > 0 %}<span class="text-success">+{{ longtime_rank_delta }}</span>{% else %}<span class="text-danger">{{ longtime_rank_delta }}</span>{% endif %})</td>
+        <td class="text-right">{{ longtime_rank }}</td>
+        <td class="text-right">{% if longtime_rank_delta is none %}{% elif longtime_rank_delta > 0 %}<span class="text-success"><i class="fa fa-long-arrow-up"></i>{{ longtime_rank_delta }}</span>{% elif longtime_rank_delta < 0 %}<span class="text-danger"><i class="fa fa-long-arrow-down"></i>{{ -longtime_rank_delta }}</span>{% endif %}</td>
         <td class="text-right">{{ rank }}</td>
-        <td><img src="{{ url_for('static', filename='img/Transparent.gif') }}" class="flag flag-{{ entry.receiver.country.iso2|lower }}" alt="{{ entry.receiver.country.iso2 }}"/> {{ entry.receiver|to_html_link|safe }}</td>
+        <td>{{ entry.receiver.country|to_html_flag|safe }} {{ entry.receiver|to_html_link|safe }}</td>
         <td>{{ entry.receiver.airport|to_html_link|safe }}</td>
         <td class="text-right">{{ '%0.1f' | format(entry.max_distance/1000.0) }}</td>
         <td class="text-right">{{ '%0.1f' | format(entry.max_normalized_quality) }}</td>
diff --git a/app/templates/receivers.html b/app/templates/receivers.html
index 3031014..119e66a 100644
--- a/app/templates/receivers.html
+++ b/app/templates/receivers.html
@@ -38,7 +38,7 @@
       {% for receiver in receivers %}
       <tr>
         <td>{{ loop.index }}</td>
-        <td><img src="{{ url_for('static', filename='img/Transparent.gif') }}" class="flag flag-{{ receiver.country.iso2|lower }}" alt="{{ receiver.country.iso2 }}"/></td>
+        <td>{{ receiver.country|to_html_flag|safe }}</td>
         <td>{{ receiver|to_html_link|safe }}</td>
         <td>{{ receiver.airport|to_html_link|safe }}</td>
         <td>{{ receiver.altitude|int }} m</td>
diff --git a/app/templates/sender_ranking.html b/app/templates/sender_ranking.html
index 0612432..093f35f 100644
--- a/app/templates/sender_ranking.html
+++ b/app/templates/sender_ranking.html
@@ -8,7 +8,7 @@
   <table id="myTable" class="datatable table table-striped table-bordered">
     <thead>
       <tr>
-        <th>#</th>
+        <th>Rank</th>
         <th>Name</th>
         <th>Aircraft</th>
         <th class="text-right">Maximum distance [km]</th>