diff --git a/src/features/online-board/api.ts b/src/features/online-board/api.ts
index ada773f9..27b26f64 100644
--- a/src/features/online-board/api.ts
+++ b/src/features/online-board/api.ts
@@ -165,10 +165,10 @@ function bitmaskToDates(bitmask: string, baseDate: string): string[] {
   // Parse baseDate — could be "yyyy-MM-ddT00:00:00" or "yyyyMMdd"
   let year: number, month: number, day: number;
   if (baseDate.includes("-")) {
-    const parts = baseDate.split("T")[0]!.split("-");
-    year = parseInt(parts[0]!, 10);
-    month = parseInt(parts[1]!, 10) - 1;
-    day = parseInt(parts[2]!, 10);
+    const parts = (baseDate.split("T")[0] ?? baseDate).split("-");
+    year = parseInt(parts[0] ?? "0", 10);
+    month = parseInt(parts[1] ?? "1", 10) - 1;
+    day = parseInt(parts[2] ?? "1", 10);
   } else {
     year = parseInt(baseDate.slice(0, 4), 10);
     month = parseInt(baseDate.slice(4, 6), 10) - 1;
diff --git a/src/features/schedule/components/DayGroupedFlightList.tsx b/src/features/schedule/components/DayGroupedFlightList.tsx
index 34f4478e..5d9c7e2b 100644
--- a/src/features/schedule/components/DayGroupedFlightList.tsx
+++ b/src/features/schedule/components/DayGroupedFlightList.tsx
@@ -45,7 +45,9 @@ interface DayGroup {
 
 function getPrimaryLeg(flight: ISimpleFlight): IFlightLeg {
   if (flight.routeType === "Direct") return flight.leg;
-  return flight.legs[0]!;
+  const first = flight.legs[0];
+  if (!first) throw new Error("MultiLeg flight has no legs");
+  return first;
 }
 
 /** Pull the local-time wall-clock date (yyyy-MM-dd) from the first leg. */
@@ -70,7 +72,7 @@ function groupFlightsByDay(flights: ISimpleFlight[]): DayGroup[] {
       const [y, m, d] = date.split("-").map((s) => parseInt(s, 10));
       return {
         date,
-        parsed: new Date(y!, (m ?? 1) - 1, d ?? 1),
+        parsed: new Date(y ?? 1970, (m ?? 1) - 1, d ?? 1),
         flights: list,
       };
     });
@@ -85,7 +87,14 @@ function depMinutes(f: ISimpleFlight): number {
   return (h ?? 0) * 60 + (m ?? 0);
 }
 function arrMinutes(f: ISimpleFlight): number {
-  const last = f.routeType === "Direct" ? f.leg : f.legs[f.legs.length - 1]!;
+  let last: IFlightLeg;
+  if (f.routeType === "Direct") {
+    last = f.leg;
+  } else {
+    const tail = f.legs[f.legs.length - 1];
+    if (!tail) return 0;
+    last = tail;
+  }
   const iso = last.arrival.times.scheduledArrival.local ?? "";
   const t = iso.slice(11, 16);
   if (!t) return 0;
@@ -96,7 +105,7 @@ function flyingMinutes(f: ISimpleFlight): number {
   const ft = f.flyingTime ?? "";
   const m = /^(\d+):(\d+)/.exec(ft);
   if (!m) return 0;
-  return parseInt(m[1]!, 10) * 60 + parseInt(m[2]!, 10);
+  return parseInt(m[1] ?? "0", 10) * 60 + parseInt(m[2] ?? "0", 10);
 }
 
 function sortFlights(flights: ISimpleFlight[], mode: SortMode): ISimpleFlight[] {
diff --git a/src/ui/flights/FlightCard.tsx b/src/ui/flights/FlightCard.tsx
index b5a02db3..510f8dbb 100644
--- a/src/ui/flights/FlightCard.tsx
+++ b/src/ui/flights/FlightCard.tsx
@@ -83,8 +83,8 @@ function formatFlyingTime(value: string, language: string): string {
   let m = 0;
   const hms = /^(\d+):(\d+):(\d+)$/.exec(value);
   if (hms) {
-    h = parseInt(hms[1]!, 10);
-    m = parseInt(hms[2]!, 10);
+    h = parseInt(hms[1] ?? "0", 10);
+    m = parseInt(hms[2] ?? "0", 10);
   } else {
     const iso = /^PT(?:(\d+)H)?(?:(\d+)M)?/.exec(value);
     if (iso) {