What distinguishes a damp lease from the other types of leases?

A damp lease is characterized by the inclusion of specified services along with the aircraft, which distinguishes it from other lease types. This arrangement typically involves the lessor providing a certain level of operational support, such as crew services, to the lessee. In contrast, a dry lease offers only the aircraft with no crew or operational services, placing all responsibilities for crew and maintenance on the lessee. This support can include pilots, training, and sometimes additional operational infrastructure, making a damp lease particularly attractive for carriers needing flexibility without entirely bearing the operational burden or those seeking immediate service without the time and investment of crew training and hiring.

Given this context, the presence of specified services adds a level of operational capability that is not available in dry leases or other types, thus influencing the operational efficiency and flexibility for the lessee.