Think about things like ease of exiting, legroom, and proximity to restrooms when choosing a seat on a KLM aircraft. When making a reservation or checking in, travelers can select their seat(s), with the selection of seats depending on the fare class and availability. KLM Airlines Check-In Policy While the comfort of economy seats varies depending on where you are, premium seats usually offer more amenities and comfort. Online seat maps make choices easier to see, and early booking improves the likelihood of getting your first choice of seats. To easily choose a seat, use the KLM mobile app or website.