The Shuttle America (dbaUAEx) flights from EWR up to YHZ and YYT are a bit weird. Sometimes they are operated by E170's with a small first-class cabin and E+; sometimes they are operated by ERJ145s. There seems to be no rhyme or reason as to which aircraft is assigned on any given day.

The E170's are nice. I like seeing them on these routes.

Incidentally, I've been told by a co-worker that the YHZ-LHR route (operated by an AC 763) is not a bad flight.