You could argue that the “Swedish Airplane Inc.” (Svenska Aeroplan Aktiebolaget, SAAB) also does cars.

Where is the B from? (S)venska (A)eroplan (A)ktiebolaget and the B? from (b)olaget?

Well… they did cars. Saab hasn’t existed as a car brand since 2016. They split from Saab aerospace in 1989.