Don't even think about booking Air Canada Rouge! Do a Google search for more information.
Sounds like they are like AC's Jazz. Worst flight for DH. Rude FAs who were incredibly fat-phobic with the shortest seatbelts DH ever experienced in what turned out to be 7 years of half-the-year work-related travel. He even wrote to them afterwards, which he NEVER does, because his history makes him turn on himself when he's ashamed, but in this case he could see that he was not the problem but THEY were. (and in that case the gate agent had put him (while looking at him) in an exit row seat, and this was early on in his travels when he simply didn't know that you couldn't have a belt extender and sit in that row, so the gate agent started it all)
I was going to say that AC seems to be fine but their lower cost versions aren't, but actually AC wasn't fine, either. On the flight I mention below they gave exact the wrong paperwork to us as we were approaching landing, so everyone from the flight had to scramble to fill the *correct* forms out after we landed. And they weren't very kind. Which I simply don't expect when I'm in Canada.
Thanks!
Why would that be bad?
In our case, we booked through United, and ended up somehow with what I remember as an Alaska flight to Vancouver, Air Canada to Heathrow, and Aer Lingus to Dublin. The first and last were fine (though less than 2 hours to get through Heathrow was ONLY enough because of luck) but the long flight was long, miserable, and HUNGRY. Our food choices hadn't gone through with the online checkin, so there was no vegetarian meal for us. Thankfully we had gotten bagels from sbx and a box of timbits during our layover in Vancouver!
So if you have any extra needs for the flight, call the actual airline you'll be flying, in advance, so those needs are noted! It's been so long since I called an airline I had forgotten that it was an option!