There's pretty good overlap between the current list of international carriers allowed to do Pre-Check and those departing from T5 at ORD. Here's the T5 departure list as an extract from the airport-ohare.com site:

Aer Lingus, AeroMexico, Air France, Air India, Alitalia, Asiana Airlines, Austrian Airlines, Avianca, British Airways, Cathay Pacific, Cayman Airways, China Eastern, Copa, Delta (Paris, France), Emirates, Ethiad Airways, Finnair, Hainan Airlines, Icelandair, KLM, Korean Air, LOT Polish Airlines, Qatar Airways, Royal Jordanian, SAS, SWISS, Turkish Airlines, Virgin Atlantic Airways, Volaris, WestJet, Xtra Airways.