Glider near miss with Airliner (emergency climb) near Chicago yesterday?
The CUUPP intersection has a cross between FL180 and 15000, CLSBY between 15000 and 13000. Every once in a while ZAU will drop you down to 9 or 7000 and hand you off to RFD approach. If you don't fly this arrival regularly there's no reason to expect 121 traffic at 7000.
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