Which of the aviation insurance coverages can be written to exclude coverage for losses arising from crashes or collisions?

Hull insurance specifically covers physical damage to an aircraft itself, and it can be tailored to exclude coverage for losses resulting from crashes or collisions. Insurers may offer policies where specific risks, such as those related to ground accidents or certain types of in-flight mishaps, can be excluded according to the needs of the insured. This flexibility allows for a more customized approach to insurance coverage, where an owner may opt to limit their exposure based on their risk tolerance or operational requirements.

When considering the other types of aviation insurance mentioned, they typically cover different aspects related to aviation operations. Airport liability focuses on claims arising from the operations of an airport and incidents occurring on airport property, which would generally include collision events. Hangarkeeper's liability is concerned with the protection of aircraft under care, custody, or control but does not usually exclude collision-related losses outright. Nonowned aircraft liability provides coverage related to the use of aircraft not owned by the insured, and again, collision losses would generally not be excluded in this context.

Therefore, hull insurance stands out as the coverage that can be specifically structured to exclude certain risks like crashes or collisions, making it the correct answer in this scenario.