There seems to be 2 distinct justifications for this. 1. The plane has to be at a safe weight to fly. I'm ok with this. 2. The airline wants to charge more mo

There seems to be 2 distinct justifications for this. 1. The plane has to be at a safe weight to fly. I'm ok with this. 2. The airline wants to charge more money for heavier passengers. This is getting into discrimination territory.