How to duplicate a bent line and change its position keeping its arrow using tikzpicture environment

Question

I am using the following answer to illustrate what I want: TikZ: Bend text so that it follows a line.

Please consider this MWE:

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{decorations.text}
\usetikzlibrary{shapes.symbols}

\begin{document}

% Bend curves from https://tex.stackexchange.com/a/22316/152550
\begin{tikzpicture}
    \def\myshift#1{\scriptsize\raisebox{1ex}}
    \node (Start) at (0,0) {Output};
    \node (End) at (-5,2) {Arrival};
    \draw [-latex,postaction={decorate,decoration={text along path,text align=center,text={|\myshift|this is an example}}}] (End) to [bend left=-5] (Start);
\end{tikzpicture}

\end{document}

I would like to add one more line without text below it. This pair must have its arrow, possibly bigger (-latex):

Thanks!

Answer 1

You can add as many postaction and preaction as you wish. Just add one more!

Update based on manooooh's comment:

But there are two differents arrows. If possible, I want the lines to be one (and a little more stuck): so one "big" arrow.

Then there is no need to use multiple postaction, it's enough to use the double key.

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{decorations.text}
\usetikzlibrary{shapes.symbols}
\usetikzlibrary{arrows.meta}
\begin{document}

% Bend curves from https://tex.stackexchange.com/a/22316/152550
\begin{tikzpicture}
    \def\myshift#1{\scriptsize\raisebox{2ex}}
    \node (Start) at (0,0) {Output};
    \node (End) at (-5,2) {Arrival};
    \draw [arrows = {-Latex[length=0pt 3 0]},double distance=5pt,double,postaction={decorate,decoration={text along path,text align=center,text={|\myshift|this is an example}}}] 

    (End) to [bend left=-5] (Start);
\end{tikzpicture}

\end{document}

Old answer:

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{decorations.text}
\usetikzlibrary{shapes.symbols}
\usetikzlibrary{arrows.meta}
\begin{document}

% Bend curves from https://tex.stackexchange.com/a/22316/152550
\begin{tikzpicture}
    \def\myshift#1{\scriptsize\raisebox{1ex}}
    \node (Start) at (0,0) {Output};
    \node (End) at (-5,2) {Arrival};
    \draw [-latex,postaction={decorate,decoration={text along path,text align=center,text={|\myshift|this is an example}}}] 
    [postaction={draw,black,thick,arrows = {-Latex[width'=0pt .5,length=15pt]}
,transform canvas={yshift=-5mm}}]
    (End) to [bend left=-5] (Start);
\end{tikzpicture}

\end{document}