Stuck in this mess at MIA, all 4 agents I've talked to confirm it's a walk-out/protest. To add insult to injury, the AC agent was really rude when I asked to be rebooked: when I told her there were earlier flights for sale she told me to go ahead and book a new ticket then. Of course, second time this week I've paid for F and will end up flying Y with a ridiculous 'refund. Keeping fingers crossed I make it out of this zoo tonight.