WASHINGTON – Orders for U.S. factory goods that signal business investment plans jumped last month by the most in more than a year, suggesting companies are confident about their business prospects.

The Commerce Department said Wednesday that orders for so-called core capital goods, which include industrial machinery, construction equipment and computers, rose 6.3 percent in January from December. A sharp fall in demand for commercial aircraft caused overall durable goods orders to drop 5.2 percent, the first decline since August.

Orders for commercial aircraft are volatile from month to month and can cause large swings in the overall figure. Boeing reported orders for only two planes in January, down from 183 in December. Orders for defense equipment also plummeted by the most in more than 12 years.