What is a wet lease?

A wet lease involves an arrangement in which the lessor supplies not only the aircraft but also the crew and maintenance services required for its operation. This type of lease is typically used when an airline needs to supplement its fleet temporarily or when entering a new market with insufficient resources. The included crew means the lessor is responsible for operating the aircraft, handling aspects such as flight operations and compliance with regulations, which relieves the lessee of these responsibilities during the lease period.

This comprehensive provision of services differentiates a wet lease from other types of leasing arrangements. In contrast, a dry lease would only involve the leasing of the aircraft itself, without crew or maintenance support, requiring the lessee to manage these aspects independently. Thus, the specific features of a wet lease make it the most complete form of aircraft leasing arrangement, aligning perfectly with the description provided in the correct answer.