"Airplanes and helicopters... are unlikely to provide the Taliban much practical value, given the expertise needed to operate and maintain them..."

"... defense analysts have said. Aircraft and aircraft components and parts could be worth more in the profits they would bring when sold on the secondary market.... Many of the seized U.S.-made small arms are likely to benefit related groups, such as Pakistani Taliban factions and militants and separatists in Kashmir and the Balochi region, said Matthew Henman, the head of terrorism and insurgency research at Janes, a defense-industry analyst. The most valuable items are Humvees and Mine-Resistant Ambush-Protected vehicles, known as MRAPs, since they support existing Taliban patrols and require limited know-how and upkeep. But some of the defense analysts said the abandoned weapons don’t provide the Taliban with an advantage over U.S. forces. 'These seizures have more propaganda value for the Taliban than any real leveling-up of capabilities,' Mr. Henman said."

From "Taliban Seize U.S. Weapons in Afghanistan, Stockpiling Helicopters, Guns and Trucks/After collapse of Afghanistan’s U.S.-supported military, grenade launchers, missiles and aircraft are now wielded by militants" (Wall Street Journal).