In the case of Western Air Lines, Inc. v. Civil Aeronautics Board et al., 1953, Western Air Lines challenged the decision made by the Civil Aeronautics Board (CAB) to grant a route extension to Transcontinental & Western Air (TWA). The Supreme Court ruled in favor of CAB and TWA, stating that CAB had acted within its authority when it granted TWA's application for an extended air route from San Francisco to Hawaii without holding a hearing on whether this would be detrimental to other airlines operating similar routes. The court found no evidence that CAB had abused its discretion or violated any statutory requirements in making this decision. Furthermore, it was determined that while competition is one factor considered by CAB when deciding on such matters, public convenience and necessity are also important considerations.

The dissenting opinion in the case of Western Air Lines, Inc. v. Civil Aeronautics Board et al., 1953, argued that the majority's decision to uphold the Civil Aeronautics Board's (CAB) order was incorrect because it failed to consider whether CAB had exceeded its statutory authority by ordering a merger between two airlines without their consent. The dissent contended that such an action violated principles of free enterprise and individual liberty protected under U.S law. It also criticized the majority for deferring too much to administrative agencies like CAB, warning this could lead to unchecked governmental power over private businesses and individuals' rights.