Lux Flyer, I have greatly appreciated your input here. It has been very helpful to me. The exchange that you and findark have had has added a lot to my understanding.

Right now, it appears united is cancelling the 3559 leg sometimes a few days in advance. For example, I noticed on 6/15 that the 6/17 flight was cancelled.

If the 3559 flight for 6/22 gets cancelled, what happens to me then? Does it cancel the EWR-SNN leg for me, because I won't be able to complete the married itinerary? Or will I be given the opportunity to rebook onto an earlier BNA-SNN flight (like what normally happens in a cancellation).