A line is parameterized by
\[\begin{pmatrix} x \\ y \end{pmatrix} = \begin{pmatrix} 0 \\ 6 \end{pmatrix} + t \begin{pmatrix} 4 \\ -6 \end{pmatrix}.\]A second line is parameterized by
\[\begin{pmatrix} x \\ y \end{pmatrix} = \begin{pmatrix} 1 \\ -7 \end{pmatrix} + u \begin{pmatrix} a \\ 9 \end{pmatrix}.\]If the two lines do not intersect, then find $a.$
Since the two lines do not intersect, they must be parallel.  In other words, their direction vectors are parallel, which means they are proportional.

Since $\begin{pmatrix} 4 \\ -6 \end{pmatrix}$ is proportional to
\[-\frac{3}{2} \begin{pmatrix} 4 \\ -6 \end{pmatrix} = \begin{pmatrix} -6 \\ 9 \end{pmatrix},\]we must have $a = \boxed{-6}.$