There are 5 Callair A-4 aircraft on the U.S. registry that TailWiki has a page for. Every one is built from the public FAA record — year, serial, engine, home base, and registration history — and owners and pilots add photos, trips, and stories on top. The ones listed here were built between 1954 and 1957.
N7581C
1957 Callair A-4
Alden, MI
N7582C
1957 Callair A-4
Tioga, ND
N6044C
1956 Callair A-4
Enoch, UT
N6028C
1954 Callair A-4
Sacramento, CA
N6046C
Callair A-4
Lubbock, TX