Integrators carry the majority of the market share of US freight, with DHL, FedEx, and UPS accounting for 62% of enplaned revenue-tons of freight. FedEx, one of the four major integrators, is undoubtedly the largest cargo carrier in the world. However, although each cargo business model has its own strengths and weaknesses, it is apparent that cargo-only carriers, integrators, and combination carriers all hold a significant portion of the market share