WASHINGTON (AP) — U.S. companies placed more orders for long-lasting goods in December from November, helped by large increase in aircraft demand. But businesses pulled back on orders that indicate investment plans.

The Commerce Department says orders for durable goods increased 4.6 percent. The increase was driven by a 10 percent gain in aircraft orders.

A core category that measures business investment plans rose just 0.2 percent, after two strong months of gains.

Orders for durable goods, which are expected to last three years, can be volatile from month to month.