Some Bibliography entry doesn't show in Latex pdf

Question

This is a MRE of my code, including the bibliography:

bibliography.bib:

@misc{openflights,
title = {{Jani Patokallio , OpenFlights}},
howpublished = {\url{https://openflights.org/about}}
}

@misc{openflightsDatabases,
title = {{Jani Patokallio , ContentShare , OpenFlights Databases Documentation}},
howpublished = {\url{https://openflights.org/data.html}}
}

@misc{passengerChart,
title = {{IEA, World air passenger traffic evolution, 1980-2020, IEA, Paris https://www.iea.org/data-and-statistics/charts/world-air-passenger-traffic-evolution-1980-2020, IEA. Licence: CC BY 4.0}},
howpublished = {\url{https://www.iea.org/data-and-statistics/charts/world-air-passenger-traffic-evolution-1980-2020}}
}

main.tex

\documentclass[12pt,a4paper,openany,oneside]{book}

\usepackage{hyperref}
\usepackage[italian]{babel}

%\usepackage[latin1]{inputenc} %Windows
\usepackage[utf8x]{inputenc} %Linux
%\usepackage[applemac]{inputenc} %Mac

\usepackage{subfigure}
\usepackage{graphicx}
\usepackage[font=small,labelfont=bf,tableposition=top]{caption}

\usepackage{listings}
\usepackage{courier}
\usepackage{color}

 \lstset{
         language=R,
         basicstyle=\footnotesize\ttfamily,
         numbers=left,           
         numberstyle=\tiny,       
         numbersep=5pt,        
         tabsize=4,                 
         extendedchars=true,         
         breaklines=true,
         keywordstyle=\textbf,           
         stringstyle=\color{black}\ttfamily,
         showspaces=false,       
         showtabs=false,           
         xleftmargin=17pt,
         framexleftmargin=17pt,
         framexrightmargin=5pt,
         framexbottommargin=4pt,
         showstringspaces=false
 }
 
 \addto\captionsitalian{%
    \renewcommand{\lstlistingname}{Codice}}

\setcounter{tocdepth}{3}
\setcounter{secnumdepth}{3} 

\usepackage[export]{adjustbox}
\usepackage{amsmath}


\usepackage{framed}

\begin{document}


\bibliographystyle{unsrt}
\title{Some Thing}
\author{Some One}


\tableofcontents


\newpage
\addcontentsline{toc}{chapter}{Bibliografia}
\bibliography{bibliography}
\end{document}

And this is the output:

As you can see, the problem is that it doens't show anything in the bibliography. I've tried to change the type to @misc, but it doesn't change anything.