The key here is that because the US government's antitrust division has been sitting on its hands for 40 years, there are now only 4 airlines in the US. This lack of competition means that all 4 can play this game (except Southwest, which has other problems) because there's not enough competition to stop it.

But there are more than 4 car companies. There's enough competition to stop this kind of horseshit, which is a fact Mary Barra seems not to recognize.