Iberia is a oneworld airline based in Spain with an underrated fully flat business class product. They’re owned by IAG, the same airline that owns British Airways, and they’re a oneworld partner of American Airlines.
The great thing about Iberia is that when you use Iberia Avios to redeem for Iberia flights they charge fewer miles than British Airways or American does and they do not add usurious fuel surcharges. What’s more they occasionally discount their already reasonable award prices.