Yes it is. When AT&T customers bought its services, they supposedly "agreed" to a a set of draconian clauses that similarly utilized AT&T's position in markets that had limited competition. The California Supreme Court on one issue, followed by the 9th U.S. Circuit Court on another, ruled that a service provider using its position in the market to add unconscionable clauses to its cohesive contracts, cannot expect a court to uphold them. The fact we haven't heard of too many lawsuits filed by airlines against customers is one indication that they don't believe they can win. Anyway, there are some legal issues to be discussed here (pertaining to contract law, consumer protection law and antitrust law), and examining them goes a lot deeper than some convenient language appearing on the airline's website.