OK - back now and just about awake.
The Air Canada flight on the way out to Vegas via Calgary was OK. Food was really quite good in Economy and the IFE excellent, being on demand. Leg room not amazing on the Atlantic leg but better on the 2 hours from Calgary to Vegas.
I'd seen reviews about unhelpful cabin crew but have to say that the ones on my flight were first class.
On the way back was with United and got put in Premium economy. Fantastic leg room on both flights (even although I was book as standard economy). IFE was OK but not amazing. Food was incredibly string tasting and not that pleasant. The snack roll (turkey and cheese) towards the end of the Atlantic flight was awful. Boarding was very swift and organised and the cabin crew were excellent.