Just 2 weeks until I head out on my first mini-rtw. Have been checking my flights and watching their on-time performance. Classic overplanning.

My first leg is all in J
YOW-EWR UA
EWR-STR UA
STR-TXL LH

Yow-ewr has some pretty poor on-time performance. Cancelled today, 2 hours late yesterday...and I've only got 60 mins to connect at EWR.

So, planning for the worst, what should I do if I miss my first connection?

Is UA only obligated to get me to STR? Will they rebook me to TXL via another flight (LHR, CDG)? Or, if the first segment is cancelled, should I call Aeroplan and ask to be re-routed on the next avail flight?

Hoping for the best, but planning for the worst...