The Alaskan problem is they more often have unique routes. Which is great and serves cool stuff, but you can’t always count on it bringing competition to your main flight. Allegiant is similar.

If you're in the western half of the country, Alaska is essentially always a route for wherever you want to go, whether staying west or going east.

If you're already on the east coast and aren't going to the west coast, then Alaska doesn't have a route. So I suppose they are "regional", where the region is about 70% of the country rather than all of it.

You don't have to go to the east coast to have trouble finding them. In St Louis they have a whole 4 flights, and 3 go to the west coast. So yes, absolutely regional. And that's the western side of the midwest. In comparison, Southwest has 55 direct destinations from the same airport. This isn't cherry picking: You have as sparse a route map from Dallas, yet another non trivial city. From there, Southwest has 70+ direct flights.

So yes, still a regional airline if your home base isn't exactly on the west coast.

No, they aren’t. Alaska is slightly more of a major carrier than Southwest, but just barely. It’s the same as Jet Blue, except it has the American partnership for code sharing that helps it have an appearance of better coverage across the US. Yes, it carries more passengers, but that doesn’t put it in the same league as the three majors.

Like Jet Blue, Alaska has a handful of wide bodies (that it got from its Hawaiian acquisition) and does a few international routes on its own metal, but it is an airline you fly domestically and that primarily serves the west coast most effectively.

It’s not a bad airline (it’s also not anything special), but it’s not the equivalent of American, United, or Delta. And that isn’t to say the individual flying experience might not be the same as those carriers, but it’s not the same class of operation as a business. Again, it does a handful of international flights. To me, major means you have an array of wide-body jets and a large international operation. Not a few seasonal routes on its 29 wide-bodies. For comparison, American has a fleet of 137 wide body jets. Delta has 179. United has over 240.

These are not the same.

Southwest is even less of a major carrier. It’s got a lot of marketshare from its previous era focused on selling the idea that it was cheaper than the majors, but it operates one type of jet, has zero wide bodies and its international destinations don’t count.

And while Alaska might have to use American to pad out its network of flights at major hubs and markets, at least it can. Southwest’s design to eschew major hubs means that tou can’t get a lot of direct flights to major cities. If it happens to fly where you travel to, fine, but otherwise you have to look at at least one hop and go to a smaller airport than what you might expect.

> Like Jet Blue, Alaska has a handful of wide bodies

Jetblue doesn’t have widebody aircraft, but they still offer transatlantic connections.