Arrow in text mode

You can use something like A$\,\to\,$B or A\textrightarrow B (in text mode) from the textcomp package:

\documentclass{article}
\usepackage{textcomp}

\begin{document}


A$\,\to\,$B

A\textrightarrow B

\end{document}

With fontspec, you can simply paste the Unicode glyphs for arrows after selecting any font that contains them, or use commands such as \char"2194 or \symbol.