Demonstrators prepared to launch another day of protests in Chicago as world leaders continue to meet at the NATO summit.
On the way into formal NATO talks, Presidents Obama, Karzai of Afghanistan and Zardari of Pakistan had a brief consultation.
Pakistan's refusal to allow NATO to resupply its troops through Pakistani territory has hampered alliance efforts in Afghanistan.
"We need to work through the sort of tension that have inevitably come up after ten years of conflict. President Zardari said he thought these issues could be worked out," said Obama.
Summit leaders think the framework for peace they adopted two years ago is working, that Afghans are on track to provide their own security in a couple of years with continued help.
The 50 Afghanistan partners will still provide security training and a four-billion a year subsidy for afghan security after troops are gone.
Former Secretary of State Madeline Albright says she is an optimist on Afghanistan and her main concern is that Afghan women may be again relegated to second-class citizenship after NATO stewardship ends.
"Societies are more stable when women are economically and politically empowered and we don't want to see the story go backwards in any way," said Albright.
Protesters meanwhile target aircraft-maker Boeing a vital cog, they say, in the war machine.
Boeing was shut down for the day having told its workers to stay home, for safety.
Demonstrators claimed the Boeing shutdown as a victory, celebrating with confetti, and paper airplanes.