So far so good for me too.
But, there's definitely been reports on here, and elsewhere, of a huge increase in irrops, particularly over the last month. From what I can gauge, it appears to be the result of "cross fleeting", that's flying pre merger Continental (pmCO) aircraft on pmUA routes, and vice versa. This is certainly the case with Hawaii flights, particularly from LAX (badly hit) which have overwhelmingly switched to 757-300s and there have been big problems with those. It looks to me like they have underestimated the change on maintenance needs at the hubs; don't pmCO and pmUA aircraft have different engines?
So my guess is that it's teething problems with operations post merger, and that they'll get them sorted, but painful in the short term for those caught up in it.