Per WSJ, UA is expecting to cancel about 500 of the roughly 600 departures tomorrow. WN has already pulled the plug on MDW. On a quick scan of statuses as of 7 CT, looks like most UAX are cancelled, and looks like mainline to non-hubs tomorrow cut roughly in half, with most hub flights and int'l safe. I'm sure more will be cancelled as we go on through the night and day.