diff --git a/handlers/mainHandler.py b/handlers/mainHandler.py
index 573e44f..9be6f70 100644
--- a/handlers/mainHandler.py
+++ b/handlers/mainHandler.py
@@ -7,7 +7,6 @@ from time import time
 from objects import glob
 
 flights = {}
-#flight_data_cache = b""
 clients = set()
 
 STRUCTS = {
@@ -105,8 +104,9 @@ async def handle(ws, path):
             await send_error(b"Flight not found")
         else:
             data = flights[uuid].get_all()
-            await cli.ws.send(struct.pack(b"<B%ds" % len(data),
+            await cli.ws.send(struct.pack(b"<BI%ds" % len(data),
                                           3, # packet_id
+                                          len(data),
                                           data
                                           ))