Description:00 55 42 00 Aviation. The 20s. Assembly of several series of plane. Transport, communication. Plane glances through sea and passes above an aircraft carrier. The priority of planes remains however the internal defence of the United States. Seen on fleet far off, completed coordination between the navy and the aviation, modernization because combination of both. Aerial shot of boats. Close-up on tail of plane. Boat surrounded with rows of smoke, air attack. Military operations, training. Preparations for possible wars.