Originally Posted by
mnbp
Use the DL SC as long as possible. The KLM lounge is small and crowded. They'll give you access to the SC based on the other flights same day in KLM J.
You need to leave time to catch transportation to international terminal, and clear security as no airs idea connection at ORD. Your bags should be checked yhrough. If they don't then ask the check in agent to through tag them. klm is a partner they'll do so for on different tickets.