I’d say for me it’s flying between either Toronto, Calgary or Vancouver and London.
In 2019 I took a flight from London to Toronto in an AC 777-300ER, spent almost 2 weeks in Toronto before flying to Calgary in a 'Rouge 767, then taking my first flight on my favourite airline (at the time), aircraft and livery the Air Canada New Livery 787 back to London. Amazing aircraft and everything the whole way. These do bring back memories when I fly these routes.
In 2017 I took a flight from London Gatwick to Vancouver and back. During this time I went up north to Whisslter and took a ride on a once in a life time experience, a DHC-2 landing in the middle of a glacial lake where there is nothing anywhere nearby other than the aircraft and ourselves.
This was with Air Transat. It made me take a whole new passion of aviation and created my love for Canada and Vancouver. I do hope the livery comes into the rework, as it is the livery on the A330 I look most forward to.
I’ve flown this route once on a Generic A330 (using the Air Transat callsign), it was definitely a fun and memorable flight.