Any idea why the following isn't working?
3/28 BNA-ORD on UA
3/28 ORD-LHR on UA
3/31 LHR-ORD on UA
3/31 ORD-BNA on US codeshare
Prices at $543 before clicking through and still $543 after clicking through. Other combos that I come up with that go UA-UA-UA-US work but this one doesn't.