If it lacks even the degree of luxury necessary to call its seats business class, it might only have premium economy, which is a term for seats which are entirely normal seats, but with slightly more legroom.

I would really love if USA air carriers were that consistent. Even between brands here in the States they have different names for the same level of seat and amenities. I’ve mostly got it figured out for Delta and United, but occasionally I’ll have to book a long haul flight on American Airlines and have to look up their seat classes before booking to make sure I get what I want.