Staging copy. The live site is at https://staging.data.eflight.com.
eFlight RegistryFAA data, updated daily
Maker · data as of September 25, 2026

Keller Frederick H

2 aircraft on the U.S. register. The most recent registration was July 15, 2019.

Models

FK 1 STOL1DEFIANT (KELLER)1

States

Wisconsin1Washington1

Registrations by year

0001112019

Aircraft newest first

Tail no.Maker and modelGroupOwner and baseCertificateRegisteredStatus
N4XK Keller Frederick H
FK 1 STOL
Fixed-wing, single engine Co-owned owner
Washington
Experimental 2019-07-15 Valid
N3XK Keller Frederick H
DEFIANT (KELLER)
Fixed-wing, multi-engine Individual owner
Wisconsin
Experimental 1999-06-16 Valid