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

Petroleum Air Transport, INC.

Named as the FAA publishes it on its approvals.

Holds 2 approved modifications, most of them for the Douglas DC-6. FAA spelling: Petroleum Air Transport, Inc..

Approved modifications 2 · newest first

Douglas DC-6 2
1980-04-08SA1506CE · Engine driven cabin air compressors and associated cabin pressurization controls removed. · DC-6A (USAF C-118A)
1980-04-08SA1510CE · Engine driven cabin air compressors and associated cabin pressurization controls removed. · DC-6B (Navy R6D-1Z)

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