Originally Posted by splicer100

This isn't totally correct. United business class to Canada does give United Club access. In this case it is irrelevant as OP is travelling AC. Everyone else is correct that ANA F does not grant lounge access in ORD if arriving. Your departing flight is what grants lounge access in this case.

"United Polaris is available on trans-Pacific or trans-Atlantic flights, and on flights from the U.S. to these South American destinations: Buenos Aires, Lima, Rio de Janeiro, São Paulo and Santiago. All other international routes are United Business® and include use of the United Club: Guam, Canada, Mexico, Caribbean, Central America, Colombia and Ecuador."