Message Composition

NRT, HND, FUK and KIX are categorized as “Coordinated –Level 3– Airport”, while CTS is “Schedules Facilitated –Level 2– Airport”.

Please observe the rules defined in WASG and SSIM chapter 6 and follow the detail instructions described below. Your understanding and cooperation are highly appreciated regarding request messages you send to us.

1. E-mail communications

  1. Only E-mail can be accepted to communicate with us. (SITA network is no longer available.)
  2. E-mail address ( is only used for SSIM message.
    1. Strictly SSIM chapter 6 formatted messages in plain text can be accepted in e-mail body.
    2. Do not start with “Dear”, “Hello” or anything other than SMI code.
    3. No attachments, signatures with logo or special characters should be used.
    4. If any wrong format messages are sent, the system does not recognize it as SSIM message and no reply will be made to you. (If you do not receive reply from us in 3 working days, you should contact us again.)
    5. Do not send NRT, HND, FUK, KIX and CTS messages in one e-mail. (NRT, HND, FUK, KIX and CTS messages should be sent separately.)
  3. E-mail address ( should be used to send inquiries or questions in a free text format.
  4. Whenever the personnel changes or e-mail address changes take place, immediately inform us of the changes.

2. All messages should be in a correct format in SSIM chapter 6

Basic Message Composition

SCR     SMI - Standard Message Identifier
/            Creator Reference
W21      IATA Season
10JUL  Date of Message
NRT      Clearance/Advice Airport
REYT/   Incoming Message Reference

Schedule Information Data Line
Schedule Information Data Line
  1 Action code
  2 Arrival flight designator, number
  3 Departure flight designator
  4 Start of period
  5 End of period
  6 Weekday(s) of operation
  7 Number of seat fitted
  8 IATA aircraft subtype
  9 Origin/previous station
10 Required arrival time
11 Required departure time
12 Next/destination station
13 Arrival service type
14 Departure service type


SI Supplementary information
GI General Information

SMI (Standard Message Identifier)

  • Standard messages associated with Airport Clearance Requests
    Slot Clearance Request/Reply Message (SCR)
    SCR is used for Fully Coordinated Airports <NRT/HND/FUK/KIX>.
    Schedule Movement Advice (SMA)
    SMA is used for slot requests at Facilitated Airports <NGO/CTS>.

  • Standard messages for Slot/Schedule information Requests
    Slot/Schedule Information Request/Reply Message (SIR)
    SIR , to clarify slots held by the Coordinator/Facilitator.
    Slot/Schedule Availability Query Message (SAQ)
    SAQ, to enquiry for availability of slots, but where slots are not confirmed/offered
    by the Coordinator/Facilitator.

  • Other messages
    Slot Preliminary Allocation List (SAL)
    Slot Historical and Non-Historical Allocation List (SHL)
    Outstanding Requests Change Request/Reply (WCR)
    Outstanding Requests Information Request/Reply Message (WIR)

Action Codes

Action Codes often used by Airlines
A Acceptance of an offer – no further improvement desired
B  New entrant
C Data to be changed
D  Delete data
F Historics
L Revised schedule (No offer acceptable), L Lines must be preceded by C lines.
N New request
P  Acceptance of an offer – maintain on the Waitlist
R Revised schedule (Offer acceptable), R Lines must be preceded by C lines.
V  New entrant with year round status 
Y New request (Continuation from previous adjacent Season)
Z Decline offer(SCR), Removes slotted and non-slotted flights from Waitlist(WCR)
Action Codes often used by Coordinator
H Holding
I Availability information
K Confirmation
O Offer
U Refusal(SCR), No Slot Allocated(SIR), Not eligible for historic precedence(SHL)
X Cancellation(SCR), Removed from Waitlist(WCR)

Service Types (used in JSC)

J Scheduled passenger-normal service
F Scheduled cargo
Q Mixed(Combi)

(1) Start with SMI in an e-mail body.
(2) Action code N or Y should be appropriately used for new requests only.
(3) Action code B or V should be appropriately used for new entrants only.
(4) Action code N should be used for flights which lost historics.
(5) Action code C/R or C/L should be used for historic re-timing.
(6) Action code C/L should be used for flight number changes, routing changes, swap timing within your holdings.
(7) Action code A or P should be used appropriately when you accept offers.
(8) Send WCR when you change request timings.
(9) Use SI or GI lines when you send additional information.