Okay, so I just flew into ORD from LAX on a plane that SHOULD have been my same physical plane on my next leg to Orlando.
Preparing to land, the pilot said there was some sort of hydraulic leak, that they "stopped it" and were going to land the plane into the wind and there would be fire trucks just in case. (I'm guessing the brake warning light was on). We landed without incident (fire trucks still rolled out though), but had to be towed in to the gate, and the saftey crews jumped all over the plane.

So, I checked my flight status, and my next flight was changed to a plane originating from Buffalo NY instead of the plane I was just on.
But I tracked it and it said it already arrived in ORD hours ago but was in service.

How can they really put "Late aircraft arrival" as the reason for the delay??? That just seems really wrong.