# What SIDs and STARs Are

> In airline flying, departures and arrivals often follow published procedures instead of making everything up in real time.

- Published: 2026-04-07T09:00:00.000Z
- Updated: 2026-08-15T20:04:19Z
- Category: Navigation & Routes
- Canonical page: [https://flymap.app/learn/navigation-routes/what-sids-and-stars-are](https://flymap.app/learn/navigation-routes/what-sids-and-stars-are)

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In airline flying, departures and arrivals often follow published procedures instead of making everything up in real time.

Two important procedure types are **SIDs** and **STARs**.

## 🛫 1. A SID Is a Standard Departure Route

`SID` stands for **Standard Instrument Departure**.

It is a published route used after takeoff to guide the aircraft from the airport into the wider en route system.

This helps make departures more organized and predictable.

## 🛬 2. A STAR Is a Standard Arrival Route

`STAR` stands for **Standard Terminal Arrival Route**.

It helps guide aircraft from the en route phase toward the destination airport area.

This supports smoother arrival sequencing.

## 🧭 3. These Procedures Help Traffic Flow

SIDs and STARs make it easier to manage large numbers of aircraft by creating known paths for:

- routing
- altitude changes
- speed expectations

This helps both pilots and controllers.

## ✨ What It Means

SIDs and STARs are part of how modern airports stay organized.

Instead of every aircraft improvising, many flights follow structured, published paths.

## 💡 Simple Way to Think About It

SIDs and STARs are like:
> the official on-ramps and off-ramps of the sky route system.

## 🟢 Quick Fact

Large airports often have many different SIDs and STARs depending on runway use, traffic flow, and direction of travel.

These procedure names may sound technical -  
but they are really just part of how busy airports keep arrivals and departures smooth.

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