So, I just went to co.com to see what happened to CO126 yesterday. Here's what I think happened; am I looking at this correctly.

First, I entered 126 into the Check Status box.

The flight left gate C86 at 2259 and arrived back into EWR at gate C86 at 0337 the next day (so it looks like they didn't clear customers!)

The flight then went out again (either new equipment or a repair) at 0625 and is estimated to arrive into DUB at 1732. I am guessing, though I don't know, that they may have had to switch crews. Would the initial crew have 'gone illegal'?

I went onto flightaware and right now (0845 PT), the flight is over the Atlantic with about 40 minutes until it arrives.

CO 126 from Dublin is back running again! (I couldn't find it last night). It's now leaving Dublin at 1820 (quick turnaround!) and arrives in SNN at 1916. However, it shows that CO126 leaves SNN for EWR at 1615, which must be a mistake, right? That doesn't make sense to me.