WASHINGTON - Orders for long-lasting manufactured goods fell last month for the first time since July, pulled down by plummeting orders for commercial aircraft. A category that tracks business investment posted the biggest drop in more than a year. The Commerce Department said Wednesday that orders for durable goods, which are meant to last at least three years, slid 1.2 percent in October after rising 2.2 percent in September and 2.1 percent in August. But the figure was warped by an 18.6 percent drop in orders for commercial planes, a category that bounces around from month to month. A category that tracks business investment - orders for capital goods excluding defense and aircraft - fell 0.