diff --git a/src/features/schedule/components/DayGroupedFlightList.tsx b/src/features/schedule/components/DayGroupedFlightList.tsx
index d1f9beeb..58f5560f 100644
--- a/src/features/schedule/components/DayGroupedFlightList.tsx
+++ b/src/features/schedule/components/DayGroupedFlightList.tsx
@@ -121,10 +121,10 @@ export const DayGroupedFlightList: FC<DayGroupedFlightListProps> = ({
   const { language } = useLocale();
   const { t } = useTranslation();
   const [sortMode, setSortMode] = useState<SortMode>("none");
-  // Track collapsed days. Default: every day group expanded — matches
-  // Angular which auto-opens days on initial render. User can collapse
-  // individual days by clicking the header chevron.
-  const [collapsedDays, setCollapsedDays] = useState<Set<string>>(() => new Set());
+  // Track which days the user has expanded. Default: empty — matches
+  // Angular's `p-accordion` collapsed-on-load behaviour, where the
+  // user clicks a day header to reveal its flights.
+  const [expandedDays, setExpandedDays] = useState<Set<string>>(() => new Set());
   const groups = useMemo(() => {
     const g = groupFlightsByDay(flights);
     return g.map((day) => ({ ...day, flights: sortFlights(day.flights, sortMode) }));
@@ -233,7 +233,7 @@ export const DayGroupedFlightList: FC<DayGroupedFlightListProps> = ({
   });
 
   const toggleDay = (date: string): void => {
-    setCollapsedDays((prev) => {
+    setExpandedDays((prev) => {
       const next = new Set(prev);
       if (next.has(date)) next.delete(date);
       else next.add(date);
@@ -247,7 +247,7 @@ export const DayGroupedFlightList: FC<DayGroupedFlightListProps> = ({
       {groups.map((g) => {
         const weekday = weekdayFmt.format(g.parsed);
         const dayMonth = dayMonthFmt.format(g.parsed);
-        const collapsed = collapsedDays.has(g.date);
+        const collapsed = !expandedDays.has(g.date);
         return (
           <section
             key={g.date}