First of all, contracts are bullshit. Yeah i said it.
No, not all contracts...but the vast majority are bs. The kind where two equal persons get together, draw up a contract, and then voluntarily sign it are okay. What happens in a case like this though is that an entire industry of business writes the same kind of contract, writing the same kind of unfair principles as every other business in the same industry. It's as bad or worse than price fixing by an industry.
The consumer, otherwise known as the "little guy" does not have a team of lawyers to fight for them. They mostly don't have time energy or inclination to fight either. Imagine life if you actually had time to read through that 100 pages of legalese every time you clicked the I AGREE button on your computer but there's nothing you can do anyway. Plus, who reads a contract when getting an airline ticket?? I've flown on planes, ridden trains, and taken cruises. Never even noticed a contract.
Okay, so that was the first thing. Contracts are bullshit. Bumping, a specific implementation of bullshit contracts forcing little guys into taking it in the ass from The Man are also bullshit.
Now the second issue...the specifics of the bullshit contract actually refer to bumping which is a thing that occurs prior to being boarded and certainly prior to being seated. That means The Man can only give it to the little guy in the ass prior to boarding. Once the little guy gets on the plane, he's supposed to feel safe from corporate anal rape.