Most airlines now charge an additional fee to sit in the exit rows, others will allocate at check-in (remarkably some airlines still favour these seats for much taller passengers!). You do get a lot more legroom in an exit seat, but on the downside there are a few points to remember. You will not be allowed to keep any items of hand-luggage (even books etc sometimes) by your seat/footwell area during landing and take-off periods, and as the bins above your seat may be full by the time you realise, you will have to hope for a cooperative cabin crew that will take these items off you at these periods and return them after take-off and landing!
These planes are configured in two classes of service, with very nice lie-flat sleeper suites in Executive First Class. Pioneered by Virgin Atlantic, the seats are arranged in a herringbone fashion, angled at about 45 degrees to the direction of flight, and might take a little getting used to. Due to the angle of the seats, those that want a view out the window will really have to turn their head. However, every seat is an aisle seat and there is no need to climb over your neighbor or wake them in the middle of the flight.  

Air Canada’s fleet, including the fleets of subsidiaries Air Canada Rouge and Air Canada Express, consists of 370 aircraft with 8 Boeing 787-8 Dreamliner, 13 Boeing 787-9 Dreamliner, 19 Boeing B777 300ER, 6 Boeing 777/200LR, 34 Boeing 767-300ER, 8 Airbus A330 300, 20 Airbus A321-200, 38 Airbus A319 100, 42 Airbus A320 200 Domestic, 25 Embraer E190, 20 Embraer E175, 16 Bombardier CRJ705, 30 Bombardier CRJ100/200, 42 Dash8 Q400, 26 Bombardier Dash 8-300, 23 Bombardier Dash 8-100.
✅ Trip Verified | We travelled Air Canada from Montreal to LAX yesterday in Business Class. The plane is a new Boeing 737. It seems like Air Canada is following the Rouge tradition by having the most uncomfortable seats imaginable even on a brand new plane. The thickness of the back cushion is very thin and there is a horizontal rod that is placed it seems to cause maximum discomfort. This flight is 6 hours! The foot rests are also extraordinarily cheap and won’t go down unless you get on your knees and manipulate it manually. Also, just like horrible Rouge, the seat posts are positioned so that you cannot store any hand luggage in front of your seat . The middle section has to be shared by seat neighbors. Air Canada used to be our favorite airline and now we have advised our travel agent to research any alternative to Air Canada and Rouge.
Bulkhead seats are are located immediately behind a solid cabin divider (on the PLAN below, Row 30, seats D/E/F/G/H/K). This is normally the location where a Bassinet is provided for families with babies, so can be noisier. Whilst you have no seat reclining in front of you, the legroom may at first seem spacious, but you will find that stretching your legs is not possible like in an ordinary seat. Bulkhead seats also suffer the fact that your tray table will be in the seat armrest, and this be cumbersome when left with a finished meal tray for long periods of time.

On the way back from HKG, I paid up and got the Business Class (can't remember the seat#, it was window). While obviously it is a much improved seat versus Econ, the layout, and setup is horrendous for a business class charging thousands. The seat is so uncomfortable in any seating position you try to constantly adjust it, your knee hits the side of the seat, and if you get unlucky and get a window seat, you literally must climb over the passenger next to you to get out, are you kidding me? Further, due to more seats cramped the service is suffered compared to regular 777, 330, or 767.
Our team were unanimous in selecting seats A or C, H or K in Rows 31-34 on this aircraft. On the plus side, you are at the quietest end of the cabin, will be amongst the first to deplane at destination, and stand a good choice of getting the full choice of meals on offer. Toilets are all to the rear, so no odours or queuing passengers nearby. On the downside, if the bassinet seats in Row 29/30 are full occupied by families with babies, there is a chance of occasional crying etc – so a good noise-cancelling headset would be a must. 
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