I saw someone did this. Our trip is originating at ORD, flying business class on LOT that departs from Term 5. The lounge situation at T5 is pretty bad, may not even have a lounge for LOT, not sure. Question is, can I check in at T5, then take the train to T1, clear security to go to UA Polaris lounge for a an hour ? Is it worth it ? Will I be stopped by security since my BP is clearly departing from T5 and will Polaris agent let me enter ?