A schedule file is basically a simple file containing flight schedule data.

It can come in two formats, namely SIMM, XLSX or CSV.

The SIMM format

CSST accepts the IATA Standard Schedule Information Manual (SSIM) format. The key information in the flight detail ( line 3) will be used by CSST. File size is currently limited to 20MB and files must have .ssim as file extension.

The CSV format

A properly formatted CSV file will come with a correct header line, and with .csv as file extension.

The header is used to determine which columns are present in a csv format schedule. The order of the columns is not important, and there can be additional columns containing information not directly required by CSST.

However, in cases where a mandatory column header is found missing, CSST will report it as 'Missing Column Error'

Mandatory column headers

Departure and Arrival aerodromes
Two columns which can be specified as either  IATA ADEP  and IATA ADES or ICAO ADEP and  ICAO ADES or both.

EOBT and ETA
Two columns using time format 00:00 or 0000.

Period of Operation and days of operation
Two cases are possible here:

- three columns: Start of period of operation, End of period of operation and Days of operation;
- two columns: Period of operation (ddMMMyy-ddMMMyy or ddmmyyyy-ddmmyyyy) and Days of operation.

 AO and CFN

 Here also, several options are possible:

- One column: Commercial AO designator+CFN (example KL1234)
- One column: ATC AO designator+CFN (example KLM1234)

- Two columns: Commercial  AO designator, CFN (example KL, 1234)
- Two columns: ATC AO designator, CFN (example KLM, 1234)

- Three columns: Commercial AO designator, CFN, ATC AO designator (example KL,1234,KLM)

 See below an example of csv schedule using the minimum information required:

CFN Suffix    
One column (example: P. Or included inside CFN column - example: 545L)

ATC AO designator  
One column (example: SWR)

ATC Flight ID   
One column (example:  545L

ATC AO designator and ATC Flight ID
One column (example: KLM123K)

Aircraft Type   
Specified as IATA aircraft type or ICAO aircraft type or both.

No-change indicator   
One column
- Set to Y if you do not wish CSST to change the Call Sign.
- Set to N if you allow CSST to change the Call Sign if required during deconfliction.

Change-actions indicator 
Call-sign format - Used to fix the format for a particular Flight or ‘Flights during deconfliction.  Specified as n, nA, nnAA, or nnnn.

Next CFN      
One column (example: 4567 or with suffix 4567P)

Next Commercial AO designator
One column (example: U2)

Next ATC AO designator     
One column (example: KLM)

Next flight columns  
CSST supports next flight (otherwise known as linked flight or onward flight) where the next flight AO designator is different from AO designator (example AF123 next flight BZH125).
In this case CSST will take into account BZH as the AO designator for the next flight.  
One column:  next CFN (example 1234)
One column:  Commercial AO designator of next flight +CFN (example KL123 or KL 1234)
One column:  ATC AO designator of next flight +CFN (example KLM123, KLM 1234)