As a person who alternates between Y and J depending on who's paying, and who's only flown a handful of *A, AC for me is near the top.

CM - good soft product (assuming that means the FAs and stuff right?), hard product very average...short-ish haul though it's fairly cheap as a connection off UA, though I'm surprised at what they charge in some cases on standalone flights

UA - so tremendously inconsistent...I've had very nice service on UA intl and domestic, then below average service. As with any major there's so many staff members it would be hard to keep a consistent service level, the one consistency seems to be the United Club, every one I've been in seems to be nearly identical lol, I like UA's prices and schedules to latin America so I'll keep flying them and overall my experience has been fine

AV - I find Avianca to be perhaps the best soft product service on a regular basis. The staff is always incredibly friendly. I'm not sure if that's just a company culture, I don't think it is, but more of a Colombian culture. I can't speak to the staff in SJC/LIM but even the dumber employees (who I had a lengthy fight with one day after a missed connection in BOG) in Colombia and USA-Colombia have all been very nice and helpful. That's a pretty typical hallmark of Colombia, the people are just tremendous and it shows in the airline. The aircrafts, I've always liked them with the exception of IFE, they're new IFE system is totally fine, but I'm not sure it's put to the best use, seems that some routes that should have it don't, yet I'll get it on the 25 minute flight that is BOG-MDE (which used to be on MD80s). I think this airline can go 1 of 2 ways though. The economy of Colombia is on the uptick, there's a growing middle class, there's also more visas being given out (at least it seems) so the airline is doing well, though there's clearly lots of fat to be cut (there's far too many empty seats between BOG-MDE daily, likewise for other over-served domestic routes) so if the economy turns they could be in a pinch and service could suffer.

AC - Ever since AC got their AVOD house in order and integration was complete, they've been my #1. I've never really had any issues but I'm also very easy going and don't ask for much in my travel provider. Are my standards low? Probably, but that also means that they rarely fail to meet them. To me it's a slightly above average airline, but really does well in the domestic/north-central-south American sector.