> For the complete documentation index, see [llms.txt](https://docs.unisphere.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.unisphere.io/unisphere-apis/flight-trajectory-simulation-fts.md).

# Flight Trajectory Simulation - FTS

## Basics

The Flight Trajectory Simulation allows users to request a flight simulation along a given 3D route to retrieve flight time, flight progress over time along the flight path, and energy information.

The 3D route can be defined as

1. a route-asset within NOVA, or
2. is defined with LAT/LON/ALT and sent with the request.

TO Time only current UTC day + 168h

## Simulation Modes

**Without NOVA**

{% tabs %}
{% tab title="FTS2  – With an individual Route" %}

{% endtab %}

{% tab title="Advanced - With OEM performance model" %}
**Note:** The option to simulated with an OEM owned performance model is only possible if the ID if the performance model is known by your organization. The OEM performance model is engineered by Unisphere based on flight telemetry data and then provision in the API.\
\
Same as basic except performance model ID is provided in the API request.
{% endtab %}
{% endtabs %}

**With NOVA XXX**

Speed command options

* EAS (Equivalent Airspeed) or,
* GS (Ground Speed)

{% hint style="info" %}
Ground Speed (GS) commands are often used by multicopter drones and is the speed relative to ground. When GS is commanded the autopilot (and the simulation) of the aircraft tries to reach the target ground speed whatever the wind conditions are.

Equivalent Air Speed (EAS) commands the target speed of the aircraft relative to wind. EAS commands are often used by fixed-wing and hybrid drone systems on en-route flight where their speed is measured by a pitot tube.
{% endhint %}