The word "united" suggests togetherness, partnership, and collaboration. Therefore, antonyms for "united carriers" would be words that convey division, isolation, and separation. Some antonyms for "united carriers" could be "divided carriers," "disjointed carriers," "isolated carriers," or "separate carriers." These words suggest a lack of cooperation and coordination, as well as a disjointed system. When companies are not united, it can lead to inefficiencies, miscommunication, and a lack of trust. Therefore, it is essential for companies to strive for unity and collaboration to achieve their goals and meet the needs of their customers.