That is actually kind of Buffets point. Airlines are mostly undifferentiated businesses selling a commodity service, which creates a race to the bottom with low

That is actually kind of Buffets point. Airlines are mostly undifferentiated businesses selling a commodity service, which creates a race to the bottom with low margins. In combination with being capital intensive, that makes it hard to turn a profit. You picking a cheaper airline with worse margins does not mean that airlines are a good business