The SimBrief API


The SimBrief API was created for developers who wish to include SimBrief flight planning features on their website.

When a flight plan is generated using the API, it returns an XML data file containing nearly every internal SimBrief variable which was used in the process. This provides the utmost in flexibility; developers seeking a quick and easy solution might choose to simply display the OFP text and/or PDF file on their VA’s dispatch page, while others may want to create an entire custom dispatch system along with a custom OFP layout. Because of the wide range of variables this API returns, there are many possibilities!

How it Works

First and foremost, this API does not bypass the SimBrief login system. This means that should you develop dispatch tools using the API, any pilots who wish to use them will require a SimBrief (or Navigraph) account. This is necessary as SimBrief must be able to track which AIRAC cycle to deliver to the user currently using your system.

The way you design your system is largely up to you, however when one of your users finally requests a flight plan (by pressing your system’s “Generate” button, for example), a small popup window is created to house the SimBrief background process. If your pilot is not already logged into the SimBrief website, this popup window will ask them to enter their username and password before continuing. The popup will then display a progress bar indicating the flight plan’s progress.

Once done, the popup window will automatically close and the pilot will be sent back to your website, where they will be able to view their flight plan however you choose to display it.

Using the API

Getting started is relatively simple, as all the required Javascript and PHP functions are provided for you. The basic guidelines are as follows:

  1. On the page which calls the API, you will need to include an html <form> containing the dispatch options you would like to use. The <input> names for each option are the same as those listed in the VA Integration thread. I have pasted that table below for ease of reference. Inputs not named properly will be ignored when generating the flight plan.

  2. At the very least, you must include the following inputs: ‘orig’, ‘dest’, and ‘type’. Any other omitted inputs will be replaced with default values. If the ‘route’ input is omitted, it will be replaced with the recommended route from SimBrief database.

  3. You must include <script type=“text/javascript” src=“simbrief.apiv1.js”></script> in your html tag, as it contains the necessary functions for the API to operate.

  4. The <form> containing your Dispatch Options must have at least the following property:
    <form id=“sbapiform”>.

  5. Your form’s submit button must have at least the following property:
    <input type=“button” onclick=“simbriefsubmit(‘referral_page’);”> , where “referral_page” is the link to the page you want the API to redirect to when the flight plan is ready. This is normally the output page on your website.

  6. The “simbrief.apiv1.php” file will need to be included (<?php include 'simbrief.apiv1.php'; ?>) in your output page. It should reside in the same directory as the rest of your dispatch system, however if you absolutely need to have it in a different directory, you will need to modify the “var api_dir =” line in the “simbrief.apiv1.js” file to point to the proper location.

  7. Prior to using the API, you must obtain an API key and paste it into your “simbrief.apiv1.php” file. Failure to do this will result in your flightplan requests being denied. API keys can be requested by contacting us. Please include information about your website and how you intend on using the API.

API Parameters

The <input> names for each dispatch option are as follows:

Dispatch Option Input Name Example Value 1, Example Value 2
Airline airline ABC
Flight Number fltnum 1234
Aircraft type B738
Origin orig KORD
Destination dest KSFO
Date date 11JUL13
Departure Time (Hour) deph 16
Departure Time (Minute) depm 30
Route route PLL GAROT OAL MOD4
Scheduled Time (Hour) steh 4
Scheduled Time (Minute) stem 30
Aircraft Registration reg N123XX
Aircraft Fin Number fin 123
Aircraft SELCAL selcal ABCD
ATC Callsign callsign ABC1234
Passengers pax 100
Alternate altn KLAX
Altitude fl 34000, FL340
Captain’s Name cpt JOHN DOE
Dispatcher’s Name dxname JANE DOE
Pilot ID Number pid 12345
Fuel Factor fuelfactor P00
Manual ZFW manualzfw 40.1
Extra Fuel addedfuel 0.5, 20
Extra Fuel Units addedfuel_units wgt, min
Cont Fuel (% or minutes) contpct 0.05, 0.05/15
Reserve Fuel (Minutes) resvrule 45
Taxi Out (Minutes) taxiout 10
Taxi In (Minutes) taxiin 4
Cargo Weight cargo 5.0
Departure Runway origrwy 06L
Arrival Runway destrwy 36R
Climb Profile climb 250/300/78
Descent Profile descent 84/280/250
Cruise Profile cruise LRC, CI
Cost Index civalue 25, AUTO
Aircraft Data* acdata {“cat”:“M”,“equip”:“SDE3FGHIRWY”,
“extrarmk”:“DAT/V RVR/250 RMK/EXAMPLE”,
ETOPS Rule etopsrule 180, 207
Number of Alternates altn_count 4
Avoid Alternate Airports altn_avoid KJFK KPHL KBWI
Alternate #1 altn_1_id KJFK
Alternate #1 Runway altn_1_rwy 22R
Alternate #1 Routing altn_1_route SSOXS5 SSOXS DCT SEY PARCH2
Alternate # 2-4 Ident altn_#_id KJFK
Alternate # 2-4 Runway altn_#_rwy 22R
Alternate # 2-4 Routing altn_#_route SSOXS5 SSOXS SEY PARCH2
Static ID** static_id ABC_12345

OFP Options

Dispatch Option Input Name Example Value
Plan Format planformat LIDO
Units units LBS or KGS
Detailed Navlog navlog 1 or 0 (1 enables, 0 disables)
ETOPS Planning etops 1 or 0 (1 enables, 0 disables)
Plan Stepclimbs stepclimbs 1 or 0 (1 enables, 0 disables)
Runway Analysis tlr 1 or 0 (1 enables, 0 disables)
Include NOTAMs notams 1 or 0 (1 enables, 0 disables)
FIR NOTAMs firnot 1 or 0 (1 enables, 0 disables)
Flight Maps maps detail, simple, or none
Disable SIDs omit_sids 1 or 0 (1 omits them, 0 enables them)
Disable STARs omit_stars 1 or 0 (1 omits them, 0 enables them)
Auto-Insert SID/STARs find_sidstar R or C (Prefer RNAV or Non-RNAV)

Note regarding Static ID

This option allows you to set a reference static ID string that will remain the same, even if your user subsequently edits/regenerates their flight plan through the SimBrief website. The Static ID can be any combination of letters, numbers, and the underscore ( _ ) character.

When specified, the Static ID can be used to subsequently pull up the options or data for this API flight, even if the user has since edited the flight or generated a new flight plan on the SimBrief website.

To redirect a user to the SimBrief Options page for this API flight, the following link can be used:{your_static_id}

To pull up the latest XML data for this flight through the XML fetcher script, use the following link:{user_id}&static_id={your_static_id}

Note regarding Aircraft Data

Specific airframe data, such as aircraft weight limits and onboard equipment, can now be specified using the “acdata” parameter. This data must be passed as a JSON object, for example:

"extrarmk":"DAT\/V RVR\/250 RMK\/EXAMPLE","maxpax":"146","oew":96.5,"mzfw":134.5,

The following parameters can be specified: “cat” (aircraft weight category, i.e. L, M, H, or J), “equip” (the aircraft’s onboard equipment string), “transponder” (the transponder type), “pbn” (performance based navigation string, must start with “PBN/…”), “extrarmk” (additional info to be included in Section 18 of the ICAO FPL string), “maxpax” (the maximum passenger count), “oew” (the operating empty weight), “mzfw” (the max zero fuel weight), “mtow” (the max takeoff weight), “mlw” (the max landing weight), “maxfuel” (the max fuel capacity), “hexcode” (the ICAO Mode-S Code), “per” (the ICAO performance category), and “paxwgt” (the average passenger weight to use, in pounds). All weights except the paxwgt value must be in thousands of pounds, but can be specified with up to 3 decimal places (in order to set precise values). Also note that for the “cat”, “equip”, and “transponder” options to work, all 3 must be specified. If one of the 3 parameters is missing, all 3 will be ignored.

Please ensure that your JSON string is properly encoded to be passed in a URL, otherwise it may not work correctly.

Approximating Unsupported Aircraft Types

Unsupported aircraft types can be approximated, or “faked”, by adding additional parameters to the “acdata” JSON string explained above. Simply add any or all of these 3 additional parameters to the JSON string to simulate a different aircraft type: “icao” (the ICAO aircraft identifier, max 4 characters), “name” (the aircraft name, max 12 characters), and “engines” (the aircraft engine type, max 12 characters).

For example, a JSON string which would simulate a fictional Airbus A322 might look like this:


Note that limited support is given for this feature. Please try to base your faked aircraft on an aircraft which has similar weight/characteristics. Basing a faked aircraft on an aircraft which is much lighter/heavier can cause weird fuel figures as the system will have to extrapolate well outside the weights for which the original aircraft was programmed.

Using custom user airframes with the API

It’s now possible to use a custom airframe that a user has saved to their SimBrief profile in an API request. To do so, simply have the user open the airframe for editing, and note the “Internal ID” number which appears near the top of the airframe options (it should look something like “123456_1582090020”). Then, simply send this ID in your API request instead of the aircraft type code (for example, instead of sending “B738”, you would send “123456_1582090020”).

When using this method, please note the following: Any changes that the airframe owner subsequently makes to this airframe will also immediately be reflected in any subsequent API flights you generate. Also, should the owner delete the airframe from their profile, any future API requests you make using this airframe’s Internal ID will fail with an “Unknown Aircraft” error.

View the Demo

A demo of the API can be viewed here. Please pay no attention to the page style (or lack thereof), it is merely meant to illustrate how the popup window works and what kind of information is available afterwards in the resulting XML file. It should be noted that the PHP class can also provide the data as a standard PHP array and as a JSON object.

Getting Started

If you are interested in using the API to add flight planning capabilities to your VA or website, please contact us. Please give a short description of how you will use the API, and we will send you the required files and an API key to get you started!