 \documentclass[tikz,border=00pt]{standalone} \usetikzlibrary{graphdrawing} \usetikzlibrary{graphs} \usegdlibrary{trees} \begin{document}  \begin{tikzpicture}[>=stealth, every node/.style={rectangle, rounded corners, draw, minimum size=0.00cm}] \graph [tree layout, grow=down, fresh nodes, level distance=0.0in, sibling distance=0.0in]     {     Flight 0 -> {        Flight 0 -> { 0 , 0},       Flight 0 -> { 0 },       Flight 0 -> { 0,0 }     }  }; \