# listen (473 pts)

> Answer the ICAO 4-letter code of the airport where this air traffic control communication was recorded.
>
> **Flag Format:** `Diver25{RJTT}`
>
> **Hint:**
>
> * The beginning of the audio is silent.

**Note:** The CTF author has requested that "LiveATC CYEG-Del-Gnd-Misc-Jan-18-2025-0500Z" is to be mentioned as the source of the recording.

{% file src="<https://136837830-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FIWcqtM0shGqDbusRu89k%2Fuploads%2FXXUc9Ez338z2KklZp9lM%2Flisten.mp3?alt=media&token=3ac519a5-a204-44fc-952d-27fcb00f0ba4>" %}

The challenge can be described as your average English listening test. From listening the recording multiple times, here are some parts that I can understand.

```
alright ... 15 ... by AAD ... 78 ...
2 AAD and uh we [...] it around 217 [... ]
[...] three zero we're in [...]

free to [...] for 3295 touching down on 02 in contact [...] one 3365041340 21 quickly [...]
133 65 airport, could take off 30

ya, [...]
good day everyone, contact with ground, twenty one seven [...] reporting two eighty nine 

papa alpha [... ] 107
air canada 248 coming [...]
[...] three zero five near number one 
bravo
still requesting a position of [...] two five five one

[...] three zero five seven [...]
[...] to eighty nine [...] bravo one

[...]
[...] one seven seven alpha [...]ing [...] two
sir contact departure one three three six five zero four one three five zero seventy [...] from landing [...] two

13365 airborne clear could take off [...] thirty [...] one seven seven
reporter [...] bravo to the gate [...]

e3 cleared one runway 02
[... ]
```

The most important parts are "**air canada 248"**, "**133 65 airport"**, "**touching down on 02"**, and "**could take off 30"**.

I gave these facts into GPT and it gave me this explanation.

<figure><img src="https://136837830-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FIWcqtM0shGqDbusRu89k%2Fuploads%2FZ6cVqEebNrXjU484iQ9f%2Fimage.png?alt=media&#x26;token=946cbb6f-2e8a-4e5c-8206-cf1ae1742e45" alt=""><figcaption></figcaption></figure>

To confirm, we can check on Edmonton Airport's runway numbers. We can see that it indeed has the number "02" and "30", just like what the recording says.

<figure><img src="https://136837830-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FIWcqtM0shGqDbusRu89k%2Fuploads%2FXq7HONOC04bxCju6USPs%2Fimage.png?alt=media&#x26;token=43d2b547-497b-4950-82bf-8d217deb0d89" alt=""><figcaption></figcaption></figure>

<figure><img src="https://136837830-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FIWcqtM0shGqDbusRu89k%2Fuploads%2F8rxQXKdxStQB1MYe0GKE%2Fimage.png?alt=media&#x26;token=7831d5ef-e25c-4f9d-9ec8-c225c294cb80" alt=""><figcaption></figcaption></figure>

Flag: `Diver25{CYEG}`
