The U.S. aircraft register, updated daily
Who holds what · as the FAA records the name

Air One Helicopters, INC

Holds 3 approved modifications, most of them for the Sikorsky S-58. FAA spelling: Air One Helicopters, Inc.

Approved modifications 3 · newest first

Sikorsky S-58 2Bell 212 1
1997-04-10SR00363LA · Revision of seating configuration from 14 passengers to 9 passengers or less. · 212
1989-11-29SH4570NM · Approval for takeoffs and landings up to and including 12,000 feet density altitude is authorized. · S-58DT, S-58ET, S-58FT
1989-05-26SH4539NM · Establish a nine passenger seat configuration. · S-58FT, S-58HT, S-58ET

Source: FAA Dynamic Regulatory System (type certificate data sheets, supplemental type certificates, technical standard order authorisations). An organisation's name is as the FAA spelled it on each record; related spellings are separate pages.