  Let $\{U_n\}_{n \geq 0}$ and $\{V_m\}_{m \geq 0}$ be two linear recurrence
sequences. We establish an asymptotic formula for the number of integers $c$ in
the range $[-x, x]$ which can be represented as differences $ U_n - V_m$. In
particular, the density of such integers is $0$.
