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Package hyphenat Warning: *******************************
(hyphenat)                * You have used the htt option.
(hyphenat)                * You are likely to get many Font Warning messages.
(hyphenat)                * These can usually be ignored.
(hyphenat)                *******************************.

) (./sil.aux) (/usr/local/texlive/2015/texmf-dist/tex/latex/tipa/t3cmr.fd)
(/usr/local/texlive/2015/texmf-dist/tex/latex/euenc/eu1lmtt.fd)

LaTeX Font Warning: Font shape `EU1/lmtt/b/it' in size <10> not available
(Font)              Font shape `EU1/lmtt/b/sl' tried instead on input line 8.


LaTeX Font Warning: Font shape `EU1/lmtt/b/sc' undefined
(Font)              using `EU1/lmtt/b/n' instead on input line 8.

\RequirePackage[immediate]{silence}
\WarningFilter{fontspec}{Font}
\WarningFilter{latex}{Font}
\WarningFilter{xelatex}{Font}
\documentclass{article}
\usepackage{xltxtra}

\usepackage[htt]{hyphenat}  % hyphenation in \texttt

\begin{document}
\hspace*{0.8\textwidth}\texttt{Donauschifffahrtsgesellschaft}
\end{document}

\documentclass{article}
\usepackage{silence}
\WarningFilter{latexfont}{Font}
\WarningFilter{latexfont}{Some}
\WarningFilter{hyphenat}{***}
\usepackage{xltxtra}

\usepackage[htt]{hyphenat}  % hyphenation in \texttt 

\begin{document} 
\hspace*{0.8\textwidth}\texttt{Donauschifffahrtsgesellschaft} 
\end{document}