IndexError: list index out of range

[brunolelli]

Hello guys...

What's going on with my code?

from tempfile import NamedTemporaryFile
from FlightRadar24.api import FlightRadar24API
from time import time, sleep
from datetime import datetime
import shutil
import csv
from pandas import DataFrame
import re
import threading
import schedule 
import time 
import sched, time

nav = []
n_acft_voando = []
while True:    

    fr_api = FlightRadar24API()
    empresas = ['AZU', 'GLO', 'LAN']
    #, 'JBU', 'AAL', 'DAL', 'ACA', 'UAL'
    pattern = "<(.*?)>"

    agora = datetime.now()
    dia = agora.strftime("%d/%m/%Y")
    hora = agora.strftime("%H:%M:%S")

    for i in range(0,len(empresas)):
        nav.append(len(fr_api.get_flights(airline = empresas[i])))
        dados_voo = fr_api.get_flights(airline = empresas[i])

        for k in range (0,len(dados_voo)):
            substring = re.search(pattern, str(dados_voo[k])).group(1)
            substring = substring.split(' - ')
            modelo_tail = [x.replace(" ", ";") for x in substring]
            n_acft_voando = [dia, hora, nav[0], nav[1], nav[2]]
            acft_voando=[dia, hora, modelo_tail[0]]
            print(acft_voando)

            with open(r'C:\Users\bruno\Desktop\Voos\DB\AeronavesAr.txt', 'a', newline='') as f:
                writer = csv.writer(f, delimiter=';')
                writer.writerow(n_acft_voando)

            with open(r'C:\Users\bruno\Desktop\Voos\DB\DetalhesAeronaves.txt', 'a', newline='') as f:
                writer = csv.writer(f, delimiter=';')
                writer.writerow(acft_voando)

    sleep(60)

I'm getting the following error:

Error:
IndexError                                Traceback (most recent call last)
<ipython-input-2-aac74b35f2b2> in <module>
     33             substring = substring.split(' - ')
     34             modelo_tail = [x.replace(" ", ";") for x in substring]
---> 35             n_acft_voando = [dia, hora, nav[0], nav[1], nav[2]]
     36             acft_voando=[dia, hora, modelo_tail[0]]
     37             print(acft_voando)

IndexError: list index out of range

How can I fix it?
It's interesting because, smetimes it works, and sometimes it doesn't.