Homebuilt Leviathan registrations

2 Homebuilt Leviathan aircraft on the FAA register (FAA model LEVIATHAN), newest first.

N-numberYearAircraftBased
N54UM—Homebuilt Leviathan
N56UM—Homebuilt Leviathan

Source: FAA Aircraft Registry, October 2026. Each N-number links to its aircraft page with registration record, history and accident data.