diff --git a/modern.config.ts b/modern.config.ts
index 769fffa7..3ffc29d6 100644
--- a/modern.config.ts
+++ b/modern.config.ts
@@ -12,6 +12,12 @@ export default defineConfig({
   runtime: {
     router: true,
   },
+  dev: {
+    proxy: {
+      "/api": "https://flights.test.aeroflot.ru/api",
+      "/flights": "https://flights.test.aeroflot.ru/flights",
+    },
+  },
   server: {
     ssr: {
       mode: "stream",
diff --git a/src/features/flights-map/api.test.ts b/src/features/flights-map/api.test.ts
index 07f44592..93338e01 100644
--- a/src/features/flights-map/api.test.ts
+++ b/src/features/flights-map/api.test.ts
@@ -65,7 +65,7 @@ describe("searchDestinations", () => {
     await searchDestinations(client, params);
 
     const url = extractUrl(mockFetch);
-    expect(url.pathname).toBe("/destinations/1");
+    expect(url.pathname).toBe("/flights/1/ru/destinations");
     expect(url.searchParams.get("departure")).toBe("SVO");
     expect(url.searchParams.get("arrival")).toBe("LED");
     expect(url.searchParams.get("dateFrom")).toBe("20250601");
@@ -143,7 +143,7 @@ describe("getFlightsMapCalendar", () => {
     });
 
     const url = extractUrl(mockFetch);
-    expect(url.pathname).toBe("/days/20250601/200/route/SVO-LED/flights-map/v1");
+    expect(url.pathname).toBe("/flights/v1/ru/days/20250601/200/route/SVO-LED/flights-map/");
   });
 
   it("builds correct path for connecting route", async () => {
@@ -158,7 +158,7 @@ describe("getFlightsMapCalendar", () => {
 
     const url = extractUrl(mockFetch);
     expect(url.pathname).toBe(
-      "/days/20250601/200/connections/SVO-LED-1/flights-map/v1",
+      "/flights/v1/ru/days/20250601/200/connections/SVO-LED-1/flights-map/",
     );
   });
 
@@ -172,7 +172,7 @@ describe("getFlightsMapCalendar", () => {
     });
 
     const url = extractUrl(mockFetch);
-    expect(url.pathname).toBe("/days/20250601/200/departure/SVO/flights-map/v1");
+    expect(url.pathname).toBe("/flights/v1/ru/days/20250601/200/departure/SVO/flights-map/");
   });
 
   it("parses binary days string into available date strings", async () => {
diff --git a/src/features/flights-map/api.ts b/src/features/flights-map/api.ts
index 222f0be8..f32b747f 100644
--- a/src/features/flights-map/api.ts
+++ b/src/features/flights-map/api.ts
@@ -38,7 +38,7 @@ export async function searchDestinations(
     query["arrival"] = params.arrival;
   }
 
-  return client.get<IDestinationsResponse>("destinations/1", query);
+  return client.get<IDestinationsResponse>(`flights/1/${client.locale}/destinations`, query);
 }
 
 /**
@@ -56,7 +56,7 @@ export async function getFlightsMapCalendar(
   const routeSegment = buildRouteSegment(params);
   if (!routeSegment) return [];
 
-  const path = `days/${params.date}/200/${routeSegment}/flights-map/v1`;
+  const path = `flights/v1/${client.locale}/days/${params.date}/200/${routeSegment}/flights-map/`;
   const response = await client.get<IFlightsMapDaysResponse>(path);
   return parseBinaryDays(response.days, params.date);
 }
diff --git a/src/features/online-board/api.test.ts b/src/features/online-board/api.test.ts
index 29dbd9dd..48396cc5 100644
--- a/src/features/online-board/api.test.ts
+++ b/src/features/online-board/api.test.ts
@@ -72,7 +72,7 @@ describe("searchFlights", () => {
     await searchFlights(client, params);
 
     const url = extractUrl(mockFetch);
-    expect(url.pathname).toBe("/board");
+    expect(url.pathname).toBe("/flights/v1.1/ru/board");
     expect(url.searchParams.get("dateFrom")).toBe("20250115");
     expect(url.searchParams.get("dateTo")).toBe("20250116");
   });
@@ -172,7 +172,7 @@ describe("getFlightDetails", () => {
     await getFlightDetails(client, params);
 
     const url = extractUrl(mockFetch);
-    expect(url.pathname).toBe("/onlineboard/details");
+    expect(url.pathname).toBe("/flights/v1.1/ru/onlineboard/details");
     expect(url.searchParams.get("flights")).toBe("SU100");
     expect(url.searchParams.get("dates")).toBe("2025-01-15");
   });
@@ -214,7 +214,7 @@ describe("getCalendarDays", () => {
     await getCalendarDays(client, params);
 
     const url = extractUrl(mockFetch);
-    expect(url.pathname).toBe("/v1/days/2025-01-15/31/flight/SU100/board/");
+    expect(url.pathname).toBe("/flights/v1/ru/days/2025-01-15/31/flight/SU100/board/");
   });
 
   it("builds correct path for departure type", async () => {
@@ -227,7 +227,7 @@ describe("getCalendarDays", () => {
     });
 
     const url = extractUrl(mockFetch);
-    expect(url.pathname).toBe("/v1/days/2025-01-15/31/departure/SVO/board/");
+    expect(url.pathname).toBe("/flights/v1/ru/days/2025-01-15/31/departure/SVO/board/");
   });
 
   it("builds correct path for arrival type", async () => {
@@ -240,7 +240,7 @@ describe("getCalendarDays", () => {
     });
 
     const url = extractUrl(mockFetch);
-    expect(url.pathname).toBe("/v1/days/2025-01-15/31/arrival/JFK/board/");
+    expect(url.pathname).toBe("/flights/v1/ru/days/2025-01-15/31/arrival/JFK/board/");
   });
 
   it("builds correct path for route type", async () => {
@@ -255,7 +255,7 @@ describe("getCalendarDays", () => {
 
     const url = extractUrl(mockFetch);
     expect(url.pathname).toBe(
-      "/v1/days/2025-01-15/31/route/SVO-JFK/board/",
+      "/flights/v1/ru/days/2025-01-15/31/route/SVO-JFK/board/",
     );
   });
 
diff --git a/src/features/online-board/api.ts b/src/features/online-board/api.ts
index 9abc5899..4a1f7910 100644
--- a/src/features/online-board/api.ts
+++ b/src/features/online-board/api.ts
@@ -78,7 +78,7 @@ export async function searchFlights(
   if (params.timeFrom) query["timeFrom"] = params.timeFrom;
   if (params.timeTo) query["timeTo"] = params.timeTo;
 
-  return client.get<IBoardResponse>("board", query);
+  return client.get<IBoardResponse>(`flights/v1.1/${client.locale}/board`, query);
 }
 
 /**
@@ -89,7 +89,7 @@ export async function getFlightDetails(
   client: ApiClient,
   params: FlightDetailsParams,
 ): Promise<IBoardResponse> {
-  return client.get<IBoardResponse>("onlineboard/details", {
+  return client.get<IBoardResponse>(`flights/v1.1/${client.locale}/onlineboard/details`, {
     flights: params.flights,
     dates: params.dates,
   });
@@ -107,7 +107,7 @@ export async function getCalendarDays(
   params: CalendarParams,
 ): Promise<string[]> {
   const searchSegment = buildCalendarSearchSegment(params);
-  const path = `v1/days/${params.date}/31/${searchSegment}/board/`;
+  const path = `flights/v1/${client.locale}/days/${params.date}/31/${searchSegment}/board/`;
 
   const response = await client.get<IDaysResponse>(path);
   return parseCalendarDays(response.days);
diff --git a/src/features/schedule/api.test.ts b/src/features/schedule/api.test.ts
index 625a9c8d..c6344eed 100644
--- a/src/features/schedule/api.test.ts
+++ b/src/features/schedule/api.test.ts
@@ -82,7 +82,7 @@ describe("searchSchedule", () => {
     await searchSchedule(client, params);
 
     const url = extractUrl(mockFetch);
-    expect(url.pathname).toBe("/schedule/1");
+    expect(url.pathname).toBe("/flights/1/ru/schedule");
     expect(extractMethod(mockFetch)).toBe("POST");
   });
 
@@ -146,7 +146,7 @@ describe("getScheduleDetails", () => {
     });
 
     const url = extractUrl(mockFetch);
-    expect(url.pathname).toBe("/schedule/details");
+    expect(url.pathname).toBe("/flights/v1.1/ru/schedule/details");
     expect(url.searchParams.get("flights[0]")).toBe("SU0012");
     expect(url.searchParams.get("flights[1]")).toBe("SU0013");
     expect(url.searchParams.get("dates[0]")).toBe("2025-01-15");
@@ -198,7 +198,7 @@ describe("getScheduleCalendarDays", () => {
     });
 
     const url = extractUrl(mockFetch);
-    expect(url.pathname).toBe("/v1/days/2025-01-15/382/route/SVO-LED/schedule/");
+    expect(url.pathname).toBe("/flights/v1/ru/days/2025-01-15/382/route/SVO-LED/schedule/");
   });
 
   it("builds correct path for route with connections", async () => {
@@ -212,7 +212,7 @@ describe("getScheduleCalendarDays", () => {
     });
 
     const url = extractUrl(mockFetch);
-    expect(url.pathname).toBe("/v1/days/2025-01-15/382/connections/SVO-LED-1/schedule/");
+    expect(url.pathname).toBe("/flights/v1/ru/days/2025-01-15/382/connections/SVO-LED-1/schedule/");
   });
 
   it("parses comma-separated days string into array", async () => {
diff --git a/src/features/schedule/api.ts b/src/features/schedule/api.ts
index 58307c84..2ba4ac49 100644
--- a/src/features/schedule/api.ts
+++ b/src/features/schedule/api.ts
@@ -30,7 +30,7 @@ export async function searchSchedule(
   client: ApiClient,
   params: IScheduleSearchRequest,
 ): Promise<IScheduleResponse> {
-  return client.post<IScheduleResponse>("schedule/1", params);
+  return client.post<IScheduleResponse>(`flights/1/${client.locale}/schedule`, params);
 }
 
 /**
@@ -64,7 +64,7 @@ export async function getScheduleDetails(
     if (date !== undefined) query[`dates[${i}]`] = date;
   }
 
-  return client.get<IScheduleDetailsResponse>("schedule/details", query);
+  return client.get<IScheduleDetailsResponse>(`flights/v1.1/${client.locale}/schedule/details`, query);
 }
 
 /**
@@ -82,7 +82,7 @@ export async function getScheduleCalendarDays(
     ? `connections/${params.departure}-${params.arrival}-1`
     : `route/${params.departure}-${params.arrival}`;
 
-  const path = `v1/days/${params.date}/382/${routeSegment}/schedule/`;
+  const path = `flights/v1/${client.locale}/days/${params.date}/382/${routeSegment}/schedule/`;
 
   const response = await client.get<IScheduleDaysResponse>(path);
   return parseCalendarDays(response.days);
diff --git a/src/shared/api/client.ts b/src/shared/api/client.ts
index 3d9aacc3..68e22a3d 100644
--- a/src/shared/api/client.ts
+++ b/src/shared/api/client.ts
@@ -22,7 +22,7 @@ const DEFAULT_RETRY_STATUS_CODES = [408, 429, 500, 502, 503, 504];
 
 export class ApiClient {
   private readonly baseUrl: string;
-  private readonly locale: Language;
+  readonly locale: Language;
   private readonly traceId: string | undefined;
   private readonly fetchFn: typeof fetch;
   private readonly timeoutMs: number;