Game concept
Transport Contract
The game also links it as Transport Contracts, Transport Contract's, Transport Contracts'.
From the game's encyclopedia
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Transport Contract is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Transport Contract typically involves transporting goods, like Artifacts, or escorting important character like Wards over intermediate distances." It is part of task_contracts. The game also links it as Transport Contracts, Transport Contract's and Transport Contracts'. Patch 1.20.1.2, from game/common/game_concepts/07_ep3_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/07_ep3_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.