Do major carriers own all vehicles in their fleet or do they also subcontract?

Major asset-based carriers supplement their owned rolling stock with subcontracted vehicles and owner-operators — particularly on thinner lanes or during peak periods when owned capacity fills ahead of demand. A carrier's operated fleet includes vehicles under long-term lease as well as directly purchased units. The liability and cost structure on subcontracted legs differs from owned-vehicle movements, though the shipper's contract remains with the booked carrier throughout.

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What Are Carrier Assets?