Late to this thread. Hope this helps. Besides flying with my bike, I have rented at locales around the world. I prefer to bring my bike. I agree with Peregrinopaul, and adding on, I have learned not to expect the same performance from a bike rental as my own bike. On a near top of the line Santa Cruz, I was riding downhill on a windy, gravel and scree trail. The bike fishtailed like crazy, so I slowed down until it subsided, then went at speed again. The bike fishtailed again. Neither of my IBIS Ripmos, Giant Trance, nor my old Trek Fuel bike, ever fishtailed on similar downhills.
AirCanada’s rules are much like other transatlantic airlines for bike bags, which require advance notice of any oversized luggage. From the AirCanada website on luggage/sports:
“
Bicycles are accepted on a space available basis only and should be registered at time of booking by contacting Air Canada Reservations. Each bicycle counts as one piece of baggage towards the maximum number of checked bags allowed by your fare type.”
Keep in mind that some airlines count anything not specifically bike-related inside a bike bag as regular luggage, and the bike bag or box containing clothing will cost extra as oversized luggage. I have traveled a few times with my IBIS Ripmo I (carbon, Eagle Access, top of the line components, size M), packed in my EVOC Pro Bike Travel bag. Including my 5-10s and helmet, it weighed 16 kg.
My EVOC Pro, with its all-directional wheels, was a breeze in the long Customs lines. In contrast, I observed a traveler with a cardboard bike box, and along with his wheeled luggage, he struggled to wend his way through Customs.
Also, getting from the airport to your hotel requires a vehicle large enough to hold your bike bag. If I’m not renting a large vehicle, I book a van pickup in advance. Good to know, some countries require an ultra clean bike (New Zealand).