How many planes have two levels?

Several aircraft models feature a two-level design, primarily large commercial airliners and some cargo planes. The most notable examples include the Airbus A380, which is a double-decked wide-body aircraft, and the Boeing 747, which has a partial upper deck. Additionally, some military transport aircraft and specialized cargo planes may also utilize a two-level configuration. Overall, the number of two-level planes is relatively small compared to the total number of aircraft in operation.