In the case of Hughes Tool Co. et al. v. Trans World Airlines, Inc., 1972, the Supreme Court was asked to consider whether Howard Hughes and his tool company had violated antitrust laws by acquiring a controlling interest in Trans World Airlines (TWA) and then using that control to benefit their own airframe manufacturing business at TWA's expense. The court ruled against Hughes, finding that he had indeed violated Section 7 of the Clayton Act which prohibits acquisitions that may reduce competition or create a monopoly. This decision was based on evidence showing that after gaining control over TWA, Hughes directed it to purchase planes from his own company rather than competitors offering better terms - an action deemed detrimental to TWA's financial health and competitive standing in the airline industry.

In the dissenting opinion for Hughes Tool Co. v. Trans World Airlines, Inc., Justice Rehnquist argued that the majority had misapplied federal law in its decision to hold Howard Hughes and his company liable for damages incurred by TWA due to their control of the airline's board of directors. He contended that while it was clear that Hughes exerted significant influence over TWA, there was no evidence he or his company acted with malicious intent or sought personal gain at TWA's expense - a key requirement under existing antitrust legislation. Furthermore, he pointed out inconsistencies in how courts have interpreted these laws and called on Congress to clarify them rather than leaving such important decisions up to judicial discretion.