It is very easy to draw such things, just tedious. For the future I'd kindly ask you to provide some code that at the very least defines the colors, sets some dimensions and so on, so that others do not have to start from scratch.
\documentclass[tikz,border=3mm]{standalone}
\definecolor{wt}{RGB}{210,215,219} % frame top
\definecolor{wb}{RGB}{151,154,162} % frame bottom
\definecolor{w}{RGB}{49,66,89} % window
\definecolor{pt}{RGB}{242,242,242} % plane top
\definecolor{pb}{RGB}{208,209,213} % plane bottom
\definecolor{wf}{RGB}{85,96,110} % inner frame
\definecolor{blind}{RGB}{115,119,128} % blind
\begin{document}
\begin{tikzpicture}[>=latex,pics/fuselage/.style={code={
\tikzset{fuselage/.cd,#1}%
\def\pv##1{\pgfkeysvalueof{/tikz/fuselage/##1}}%
\fill[w,rounded corners=\pv{r}-\pv{d}]
(-\pv{w}/2+\pv{d},-\pv{h}/2+\pv{d}) rectangle (\pv{w}/2-\pv{d},\pv{h}/2-\pv{d});
\clip [rounded corners=\pv{r}]
(-\pv{w}/2,-\pv{h}/2) rectangle (\pv{w}/2,\pv{h}/2);
\fill[blind] (-\pv{w}/2,\pv{h}/2-\pv{b}) rectangle (\pv{w}/2,\pv{h}/2);
\fill[wf,xshift=1.3pt,yshift=-1.3pt,even odd rule]
[rounded corners=\pv{r}]
(-\pv{w}/2,-\pv{h}/2) rectangle (\pv{w}/2,\pv{h}/2)
[rounded corners=\pv{r}-\pv{d}]
(-\pv{w}/2+\pv{d},-\pv{h}/2+\pv{d}) rectangle (\pv{w}/2-\pv{d},\pv{h}/2-\pv{d});
\draw[top color=wt,bottom color=wb,even odd rule]
[rounded corners=\pv{r}]
(-\pv{w}/2,-\pv{h}/2) rectangle (\pv{w}/2,\pv{h}/2)
[rounded corners=\pv{r}-\pv{d}]
(-\pv{w}/2+\pv{d},-\pv{h}/2+\pv{d}) rectangle (\pv{w}/2-\pv{d},\pv{h}/2-\pv{d});
}},fuselage/.cd,h/.initial=1.4cm,w/.initial=1cm,
d/.initial=0.7mm,r/.initial=4mm,b/.initial=2mm]
\path[top color=pt,bottom color=pb] (-4,-3) rectangle (4,3);
\path foreach \X in {0,...,3} {(-3+2*\X,0.5) pic{fuselage}};
\draw[|<->|] (1-0.425,0.5) -- (1+0.425,0.5) node[pos=0.75,above]{$a$};
\draw[|<->|] (1,0.5-0.625) -- (1,0.5+0.625) node[pos=0.75,left]{$b$};
\end{tikzpicture}
\end{document}

ADDENDUM: Per request a version with passengers. (These are not necessarily animals, among the TikZlings there is a snowman and three beings.)
\documentclass[tikz,border=3mm]{standalone}
\usepackage{tikzlings}
\definecolor{wt}{RGB}{210,215,219} % frame top
\definecolor{wb}{RGB}{151,154,162} % frame bottom
\definecolor{w}{RGB}{49,66,89} % window
\definecolor{pt}{RGB}{242,242,242} % plane top
\definecolor{pb}{RGB}{208,209,213} % plane bottom
\definecolor{wf}{RGB}{85,96,110} % inner frame
\definecolor{blind}{RGB}{115,119,128} % blind
\begin{document}
\begin{tikzpicture}[>=latex,pics/fuselage/.style={code={
\tikzset{fuselage/.cd,#1}%
\def\pv##1{\pgfkeysvalueof{/tikz/fuselage/##1}}%
\fill[w,rounded corners=\pv{r}-\pv{d}]
(-\pv{w}/2+\pv{d},-\pv{h}/2+\pv{d}) rectangle (\pv{w}/2-\pv{d},\pv{h}/2-\pv{d});
\clip [rounded corners=\pv{r}]
(-\pv{w}/2,-\pv{h}/2) rectangle (\pv{w}/2,\pv{h}/2);
\fill[blind] (-\pv{w}/2,\pv{h}/2-\pv{b}) rectangle (\pv{w}/2,\pv{h}/2);
\tikzling[scale=0.6,yshift=-2cm]
\fill[wf,xshift=1.3pt,yshift=-1.3pt,even odd rule]
[rounded corners=\pv{r}]
(-\pv{w}/2,-\pv{h}/2) rectangle (\pv{w}/2,\pv{h}/2)
[rounded corners=\pv{r}-\pv{d}]
(-\pv{w}/2+\pv{d},-\pv{h}/2+\pv{d}) rectangle (\pv{w}/2-\pv{d},\pv{h}/2-\pv{d});
\draw[top color=wt,bottom color=wb,even odd rule]
[rounded corners=\pv{r}]
(-\pv{w}/2,-\pv{h}/2) rectangle (\pv{w}/2,\pv{h}/2)
[rounded corners=\pv{r}-\pv{d}]
(-\pv{w}/2+\pv{d},-\pv{h}/2+\pv{d}) rectangle (\pv{w}/2-\pv{d},\pv{h}/2-\pv{d});
}},fuselage/.cd,h/.initial=1.4cm,w/.initial=1cm,
d/.initial=0.7mm,r/.initial=4mm,b/.initial=3mm]
\path[top color=pt,bottom color=pb] (-4,-3) rectangle (4,3);
\path foreach \X in {0,...,3} {(-3+2*\X,0.5) pic{fuselage}};
\end{tikzpicture}
\end{document}

These are randomly chosen TikZlings, in each compilation you will get a random set. If you do not like this randomness, use \pgfmathsetseed{<int>} where int is an integer.