diff --git a/agenda/trip.py b/agenda/trip.py
index fad4c4b..837deb4 100644
--- a/agenda/trip.py
+++ b/agenda/trip.py
@@ -1,6 +1,7 @@
 """Trips."""
 
 import os
+import typing
 from datetime import date, datetime, time
 from zoneinfo import ZoneInfo
 
@@ -121,6 +122,29 @@ def build_trip_list(
     return [trip for _, trip in sorted(trips.items())]
 
 
+def add_coordinates_for_unbooked_flights(
+    routes: list[StrDict], coordinates: list[StrDict]
+) -> None:
+    """Add coordinates for flights that haven't been booked yet."""
+    if not (
+        any(route["type"] == "unbooked_flight" for route in routes)
+        and not any(pin["type"] == "airport" for pin in coordinates)
+    ):
+        return
+
+    data_dir = flask.current_app.config["PERSONAL_DATA"]
+    airports = typing.cast(dict[str, StrDict], travel.parse_yaml("airports", data_dir))
+    lhr = airports["LHR"]
+    coordinates.append(
+        {
+            "name": lhr["name"],
+            "type": "airport",
+            "latitude": lhr["latitude"],
+            "longitude": lhr["longitude"],
+        }
+    )
+
+
 def collect_trip_coordinates(trip: Trip) -> list[StrDict]:
     """Extract and deduplicate airport and station coordinates from trip."""
     stations = {}
diff --git a/web_view.py b/web_view.py
index 09f53ce..90e9aaf 100755
--- a/web_view.py
+++ b/web_view.py
@@ -7,7 +7,6 @@ import operator
 import os.path
 import sys
 import traceback
-import typing
 from datetime import date, datetime, timedelta
 
 import flask
@@ -22,7 +21,7 @@ import agenda.holidays
 import agenda.thespacedevs
 import agenda.trip
 from agenda import format_list_with_ampersand, travel, uk_tz
-from agenda.types import StrDict
+from agenda.types import Trip
 
 app = flask.Flask(__name__)
 app.debug = False
@@ -315,20 +314,20 @@ def human_readable_delta(future_date: date) -> str | None:
     return " ".join(parts) if parts else None
 
 
-@app.route("/trip/<start>")
-def trip_page(start: str) -> str:
-    """Individual trip page."""
-    route_distances = agenda.travel.load_route_distances(app.config["DATA_DIR"])
-    trip_list = [
+def get_trip_list(route_distances: agenda.travel.RouteDistances) -> list[Trip]:
+    """Get list of trips respecting current authentication status."""
+    return [
         trip
         for trip in agenda.trip.build_trip_list(route_distances=route_distances)
         if flask.g.user.is_authenticated or not trip.private
     ]
 
-    trip_iter = iter(trip_list)
-    today = date.today()
-    data_dir = flask.current_app.config["PERSONAL_DATA"]
 
+def get_prev_current_and_next_trip(
+    start: str, trip_list: list[Trip]
+) -> tuple[Trip | None, Trip | None, Trip | None]:
+    """Get previous trip, this trip and next trip."""
+    trip_iter = iter(trip_list)
     prev_trip = None
     for trip in trip_iter:
         if trip.start.isoformat() == start:
@@ -336,26 +335,25 @@ def trip_page(start: str) -> str:
         prev_trip = trip
     next_trip = next(trip_iter, None)
 
+    return (prev_trip, trip, next_trip)
+
+
+@app.route("/trip/<start>")
+def trip_page(start: str) -> str:
+    """Individual trip page."""
+    route_distances = agenda.travel.load_route_distances(app.config["DATA_DIR"])
+    trip_list = get_trip_list(route_distances)
+
+    prev_trip, trip, next_trip = get_prev_current_and_next_trip(start, trip_list)
     if not trip:
         flask.abort(404)
 
+    today = date.today()
+
     coordinates = agenda.trip.collect_trip_coordinates(trip)
     routes = agenda.trip.get_trip_routes(trip)
-    if any(route["type"] == "unbooked_flight" for route in routes) and not any(
-        pin["type"] == "airport" for pin in coordinates
-    ):
-        airports = typing.cast(
-            dict[str, StrDict], travel.parse_yaml("airports", data_dir)
-        )
-        lhr = airports["LHR"]
-        coordinates.append(
-            {
-                "name": lhr["name"],
-                "type": "airport",
-                "latitude": lhr["latitude"],
-                "longitude": lhr["longitude"],
-            }
-        )
+
+    agenda.trip.add_coordinates_for_unbooked_flights(routes, coordinates)
 
     for route in routes:
         if "geojson_filename" in route: