The important part for answering this question is: Airboats are a very popular means of transportation in marshy and / or shallow areas where a standard inboard or outboard engine with a submerged propeller would be impractical, most notably in the Florida Everglades but also in the Indian River Lagoon, the Kissimmee and St. Johns rivers, and the Mekong River and Delta, as well as the Louisiana bayous and Mesopotamian Marshes.
This justifies what answer for what question? Q & A: 
Passage: Airboats are a very popular means of transportation in marshy and / or shallow areas where a standard inboard or outboard engine with a submerged propeller would be impractical, most notably in the Florida Everglades but also in the Indian River Lagoon, the Kissimmee and St. Johns rivers, and the Mekong River and Delta, as well as the Louisiana bayous and Mesopotamian Marshes.

Question: Based on this passage, what kind of boat is used in the everglades?
Airboats