In some instances, a fee for a challenge may also be charged. Status challenges are employed by other types of establishments, as well, such as casinos and hotels. Some airlines will match status with that of a competitor upon application, usually to airlines outside of any alliance that the airline used to match status with belongs to. This enables travellers to switch their travel more easily from one carrier to another (e.g., when the traveller's employer switches carriers due to a new travel contract's being signed). It does so by maintaining equivalent elite benefits with the new airline, without the need for time to pass while the traveller earns the benefits; this also has the side effect of retaining elite benefits with the previous airline, in order that one does not have to be given up for the other to allow for a more gradual transition. Status matches are employed by other types of establishments, as well, such as casinos, cruise lines, hotels, and rental car companies.