Definition
A carrier is any person, company, or entity that undertakes to transport persons or property from one place to another, whether for compensation or gratuitously, by any means of conveyance — land, water, or air. The term encompasses two legally distinct categories that carry dramatically different obligations:
1. Common carrier: An entity that holds itself out to the general public as being in the business of transporting persons or goods for hire, without discrimination among customers. Common carriers bear a heightened duty of care — historically characterized as near-absolute liability for loss or damage to goods, and extraordinary care for passenger safety.
2. Private carrier: An entity that agrees to transport goods or persons only in a particular instance, not as a general business vocation, and not by holding itself out to the public at large. Private carriers are held only to ordinary negligence standards — the care a reasonably prudent person would exercise under similar circumstances.
The distinction between common and private carrier is the central legal fault line. It determines applicable duty of care, available defenses, regulatory oversight, and in admiralty contexts, the applicability of liability limitation regimes such as COGSA.
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Common Language
Modern common usage (Wiktionary): A person or object that carries someone or something else; also informally used for aircraft carriers, carrier bags, carrier pigeons, and in telecommunications, a signal-carrying entity.
Historical common usage (Webster's 1913): One who carries or conveys; a messenger; one employed to carry goods for others for hire — a porter or teamster.
The common-language meaning of carrier is broad and intuitive: anything or anyone that moves something from one place to another. The legal meaning is considerably narrower and more consequential. In law, the classification of a carrier as common or private is not a factual observation about what someone does on a given day — it is a legal status that turns on public holding-out, regularity of business, and willingness to serve the general public. A company that hauls freight regularly but only for selected clients under private contract may be doing the same physical act as a common carrier while bearing substantially different legal obligations.
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Common Confusion
CARRIER vs. BAILEE: Because a carrier takes temporary possession of goods belonging to another, some sources treat carrier liability as a species of bailment. This framing is historically important but legally imprecise. A bailee's duty is generally ordinary care; a common carrier's duty at common law was stricter — closer to that of an insurer against loss, subject to defined exceptions (act of God, public enemy, inherent vice, shipper's fault, act of public authority). Researchers encountering 19th-century treatise discussions of carrier liability within bailment chapters should not assume the two concepts are interchangeable.
COMMON CARRIER vs. CONTRACT CARRIER: In modern regulatory contexts, particularly in transportation law and ICC/STB proceedings, contract carrier has emerged as a distinct intermediate category — an entity that serves a limited number of customers under individual contracts, falling between true private carriage and common carriage. Historical sources do not use this term; it is a 20th-century regulatory development largely invisible in Bouvier, Burrill, or early Black's.
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Recognized Forms
/SUBTYPES
Common carrier: Holds itself out to the general public; subject to heightened duty of care; historically near-strict liability for cargo loss; subject to federal and state regulatory regimes.
Private carrier: Agrees to transport in particular instances only; held to ordinary negligence standard; not subject to common carrier regulatory obligations.
Contract carrier: Modern regulatory category; transports for a limited number of shippers under individually negotiated contracts; distinct from both common and private carrier under federal transportation statutes.
Carrier by land: Stagecoach operators, railroads, trucking companies, bus lines. Governed historically by common law; now extensively regulated by federal statute.
Carrier by water: Ship operators, ferries, inland waterway carriers. Subject to admiralty jurisdiction and, for ocean cargo, the Carriage of Goods by Sea Act (COGSA) where applicable.
Air carrier: Airlines and cargo air carriers. Governed by the Warsaw Convention, Montreal Convention, and the Federal Aviation Act framework, which substantially displaced common-law carrier rules.
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Why It Matters in Research
The common/private carrier distinction is the threshold question in virtually every carrier liability research problem. Researchers must identify which category applied at the relevant time and place before the duty-of-care analysis can begin. This distinction was sharper at common law than it sometimes appears in modern sources, where statutory regimes have blurred the edges.
Historical sources — particularly Bouvier and Burrill — treat carrier liability primarily through the lens of cargo and goods. The extension of common carrier doctrine to passenger safety was a 19th-century development that accelerated with railroad litigation. Researchers working on pre-railroad sources should not assume passenger-protective doctrine was well developed.
The Black's Law Dictionary (2nd Ed.) definition explicitly flags compensation as non-dispositive: carriage "with or without compensation" can still qualify as carrier activity. This matters for gratuitous carrier cases, where some jurisdictions applied only ordinary negligence rather than the strict common carrier standard.
In admiralty and maritime research, COGSA introduces a contractual overlay that modifies common-law carrier obligations for ocean shipments. The statute's package limitation and fair opportunity doctrine interact with — and sometimes override — what common law would otherwise require. Researchers should not assume that general common carrier principles translate directly into ocean cargo disputes without checking COGSA applicability.
Modern telecommunications use of carrier (wireless carrier, common carrier under the Communications Act) is a separate regulatory term of art that has generated its own body of administrative and constitutional law. Historical dictionary definitions do not anticipate this usage at all.
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Historical Dictionary Support
The historical dictionaries present a consistent core definition — one who undertakes to transport goods from one place to another — while varying in depth of elaboration.
Burrill is the most compact: carriage may be for hire or without hire, and readers are directed to Angell on Carriers for substantive doctrine. This signals that 19th-century treatise literature, not dictionary entries, carried the doctrinal weight.
Bouvier is the most complete, explicitly stating that carriers are either common or private, noting that private carriers are held to ordinary care, and cross-referencing the separate entry for Private Carrier. Bouvier's citation to Moore on Carriers reflects the treatise tradition that dominated carrier law in the formative American period.
Both editions of Black's track Bouvier's structure. The 2nd edition explicitly addresses persons as well as property, and it is the first in this set to use the formulation "with or without compensation" — a refinement reflecting growing case law on gratuitous carriage.
Anderson's Dictionary of Law, as represented in the source material here, is not directly useful for the carrier definition — the excerpt provided addresses carriage (the physical vehicle or act) rather than carrier (the legal actor). Researchers should note this ambiguity in historical sources: carriage and carrier are related but distinct entries, and confusion between vehicle-focused doctrine and party-focused doctrine occasionally appears in older opinions.
What the historical sources collectively miss: air carriers, telecommunications carriers, the contract carrier category, and the statutory regimes (COGSA, Warsaw Convention, Carmack Amendment) that now govern most commercial carriage disputes. A researcher relying solely on historical dictionary definitions would have an accurate framework for 19th-century common-law analysis but would need to layer in substantial statutory and regulatory material for any modern dispute.
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Jurisdictional Note
Common carrier status and its attendant duties were historically creatures of common law, and state courts developed the doctrine independently. Federal law now controls most interstate carriage through the Carmack Amendment (rail and motor freight), COGSA (ocean), and the Montreal Convention (air). State common carrier law retains relevance primarily for intrastate transportation and for passenger injury claims where federal preemption is incomplete.
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Encyclopedia Cross-Reference
COGSA — Carrier Liability, Package Limitation, and the Fair Opportunity Doctrine (Law Mind Military, Veterans & Admiralty Law Encyclopedia)
Motor Vehicle and Transportation Torts — Common Carrier Liability: Airlines, Railroads, Buses (Law Mind Torts & Personal Injury Encyclopedia)
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