gusd

I tried searching for this, but was unsuccessful.

I haven't seen this one before. I am watching UA132 these days, as I will be on it soon and will have a short connection in MUC. Yesterday, the flight arrived over 3 hours late, the reason was "Delayed-Operations" The inbound from MUC had arrived early.

Does anybody know what this delay means? I presume it has something to do with UA's operations, rather than airport operations, as those would be under "airport conditions preventing departure", right? But what kind of operations issue would cause a 3 hour delay at a hub?

Thanks