A linehaul run might be solo or be done by a team. While solo runs might be shorter, with the driver returning to home base at the end of the run, driving teams of two might be away from home for even a week, going thousands of miles transcontinental.
This operation is also divided into subtypes of contracts: dedicated, unassigned and spot.
Dedicated runs have assigned start and end points. So your truck will be moving between the same point A and point B every time. Unassigned runs always originate in one spot but have no regular endpoint; they are called in to fill extra capacity needed by routes that dedicated runs could not serve. Spot runs are like P&D routes where you travel in your territory daily with semis, hauling larger cargo than do P&D runs. Dedicated routes are more desirable for owners as they allow for an easy projection of revenue and costs.
The cost of linehaul routes is higher (as compared to a P&D route) because the trucks are larger, and a large vehicle on the road presents inherent risks. Additionally, these trucks are expensive to buy, maintain, and repair. However, revenue is also bigger and with FedEx having to buy more one-time-purchased power to haul their trucks across the country, linehaul routes might be worth considering strongly.