diff --git a/agenda/trip.py b/agenda/trip.py
index 3d41f2d..e730ad4 100644
--- a/agenda/trip.py
+++ b/agenda/trip.py
@@ -136,42 +136,29 @@ def load_flights(flight_bookings: list[StrDict]) -> list[StrDict]:
     return flights
 
 
-def build_trip_list(
+def collect_travel_items(
+    flight_bookings: list[StrDict],
     data_dir: str | None = None,
     route_distances: travel.RouteDistances | None = None,
-) -> list[Trip]:
+) -> list[StrDict]:
     """Generate list of trips."""
-    trips: dict[date, Trip] = {}
-
     if data_dir is None:
         data_dir = flask.current_app.config["PERSONAL_DATA"]
 
-    yaml_trip_list = travel.parse_yaml("trips", data_dir)
-
-    yaml_trip_lookup = {item["trip"]: item for item in yaml_trip_list}
-
-    flight_bookings = load_flight_bookings(data_dir)
-
-    travel_items = sorted(
-        load_flights(flight_bookings)
+    return sorted(
+        load_flights(load_flight_bookings(data_dir))
         + load_trains(data_dir, route_distances=route_distances)
         + load_ferries(data_dir, route_distances=route_distances),
         key=depart_datetime,
     )
 
-    data = {
-        "flight_bookings": flight_bookings,
-        "travel": travel_items,
-        "accommodation": travel.parse_yaml("accommodation", data_dir),
-        "conferences": travel.parse_yaml("conferences", data_dir),
-        "events": travel.parse_yaml("events", data_dir),
-    }
-
-    for item in data["accommodation"]:
-        price = item.get("price")
-        if price:
-            item["price"] = decimal.Decimal(price)
 
+def group_travel_items_into_trips(
+    data: StrDict, yaml_trip_list: list[StrDict]
+) -> list[Trip]:
+    """Group travel items into trips."""
+    trips: dict[date, Trip] = {}
+    yaml_trip_lookup = {item["trip"]: item for item in yaml_trip_list}
     for key, item_list in data.items():
         assert isinstance(item_list, list)
         for item in item_list:
@@ -187,6 +174,34 @@ def build_trip_list(
     return [trip for _, trip in sorted(trips.items())]
 
 
+def build_trip_list(
+    data_dir: str | None = None,
+    route_distances: travel.RouteDistances | None = None,
+) -> list[Trip]:
+    """Generate list of trips."""
+    if data_dir is None:
+        data_dir = flask.current_app.config["PERSONAL_DATA"]
+
+    yaml_trip_list = travel.parse_yaml("trips", data_dir)
+
+    flight_bookings = load_flight_bookings(data_dir)
+
+    data = {
+        "flight_bookings": flight_bookings,
+        "travel": collect_travel_items(flight_bookings, data_dir, route_distances),
+        "accommodation": travel.parse_yaml("accommodation", data_dir),
+        "conferences": travel.parse_yaml("conferences", data_dir),
+        "events": travel.parse_yaml("events", data_dir),
+    }
+
+    for item in data["accommodation"]:
+        price = item.get("price")
+        if price:
+            item["price"] = decimal.Decimal(price)
+
+    return group_travel_items_into_trips(data, yaml_trip_list)
+
+
 def add_coordinates_for_unbooked_flights(
     routes: list[StrDict], coordinates: list[StrDict]
 ) -> None:
@@ -211,7 +226,7 @@ def add_coordinates_for_unbooked_flights(
 
 
 def collect_trip_coordinates(trip: Trip) -> list[StrDict]:
-    """Extract and deduplicate airport and station coordinates from trip."""
+    """Extract and de-duplicate airport and station coordinates from trip."""
     stations = {}
     station_list = []
     airports = {}
@@ -368,6 +383,7 @@ def get_trip_routes(trip: Trip) -> list[StrDict]:
 def get_coordinates_and_routes(
     trip_list: list[Trip], data_dir: str | None = None
 ) -> tuple[list[StrDict], list[StrDict]]:
+    """Given a list of trips return the associated coordinates and routes."""
     if data_dir is None:
         data_dir = flask.current_app.config["PERSONAL_DATA"]
     coordinates = []