(4)
Use one of the following four-letter designators when addressing Air Traffic Service messages, i.e., Flight Plan messages, Amendment messages, and Flight Plan cancellation messages, to Air Traffic Service units:

(a) ZOZX - For an Oceanic Air Traffic Control Center.
(b)
ZPZX - For an Air Traffic Services Reporting Office.

(c)
ZQZX - For a computer facility at Area Control Center/Air Route Traffic Control Center or if message is relevant to an IFR flight.

(d)
ZRZX - For Area Control Center/Air Route Traffic Control Center when message is relevant to a VFR flight.

(e) ZTZX - For an airport control tower.

(5)
Consult local directives for any special addressing required by the aircrew.

FILING DATE/TIME - Enter six-digit Date/Time group to indicate UCT filing time of flight plan. The first two digits will show date of month. The last four digits will show the time. Example: 211145.
ORIGINATOR INDICATOR - Enter eight-letter sequence similar to ADDRESSEE INDICATOR identifying the place of origin and the organization/agency originating the message.
SPECIFIC IDENTIFICATION OF ADDRESSEE(S) AND/OR ORIGINATOR - When the four-letter designator YXYZ, ZZZX, or YYYX is indicated in the ADDRESSEE and/or ORIGINATOR INDICATORS, enter the following information:
(a)
The name of the organization or the identity of the aircraft.

(b)
The order of such entries shall be the same as the order of the ADDRESSEE and/or ORIGINATOR INDICATORS.

(c)
Where there is more than one such entry, add the word "STOP" after the last entry.

(d)
When entry includes both addressee indicator and originator indicator, enter the word "FROM" the originator indicator.

1 PILOTS: Complete following items in Flight Plan.

Item 7
AIRCRAFT IDENTIFICATION - Use the approved tactical call sign or the applicable code below, followed by the last five digits of the aircraft tail/bureau number except: S - Use the last five digits of the aircraft tail number or assigned call sign. SPAR - Use two digits assigned by MAJCOM. Codes: A - Air Force E - EVAC VV - Navy RCH - AMC (See NOTE) R - Army S - Special Air Missions (89 AW) VM - Marine Corps SPAR - Other Special Air Missions G - Air or Army National Guard AIO - AIR CHIEF (Chief of Staff USAF) C - Coast Guard
Formation flights will only use the radio call of the leader's aircraft
NOTE: When required to use the diplomatically cleared mission number as the call sign, AMC aircraft may file the mission number, e.g.,
RCH2W or the tail number.

Mode S - Flight Plans and Transponders
Aircrew MUST ensure that the tail-number-assigned 24-bit code (entered in as an 8-digit octal) match exactly to the default code for that particular aircraft. Use of DYNAMIC codes is an alternative, but only in accordance with Service specific guidance. NO TWO AIRCRAFT MUST EVER BE AIRBORNE WITH THE SAME CODE. Erroneous or duplicate codes compromise the safety and efficiency of air traffic control.
It is imperative also that the callsign entered in the flight plan (7-characters) match EXACTLY to the Flight Identification entered into the Mode S transponder interface:

NOTE: What is entered at Item 7 must match exactly what is entered in the Mode S Aircraft Identification (also known as Flight ID) input device in the cockpit. If it does not, then the aircraft will not be correlated with its stored flight plan and delays will ensue. There must be no spaces between the designator letters and flight number, nor any zeros preceding the flight number. If filed call sign or identification entered into field 7 of the flight plan is less than 7 characters, then place spaces at the end of the Flight ID entered in the cockpit.
SSR - If a discrete SSR Code has been assigned to the aircraft or the flight, insert a  "/ " followed by one letter giving the SSR Mode followed by 4 numerics giving the assigned SSR Code.
　
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