That was my first thought, too. Obviously not, though--I'm not going to be IDBed a month ahead (though if they would process the compensation and send it to me now I'd be OK with that! )

It is/was a US-stock ticket with UA segments. Sounds like it's not uncommon to have that code show up under those circumstances. And I'll definitely be using that leeway if it gets screwed up somehow, though for the moment it was just ~20 minute changes which don't ruin my onward connections.