MRO stands for Maintenance, Repair and Overhaul — the industry shorthand for the organisations, facilities, and programmes that perform scheduled and unscheduled maintenance on aircraft, engines, and components. The regulatory backbone differs by jurisdiction: FAA Part 145 repair stations in the United States, EASA Part-145 in Europe, CASA Part 145 in Australia, and CAR 573 in Canada. A shop holding one of those approvals is legally authorised to sign off an aircraft's return to service.
The term covers three distinct activities. Maintenance is the routine, scheduled work — inspections, phase checks, and component replacements tied to airframe hours, cycles, or calendar intervals. Repair is the unscheduled work: an AOG (Aircraft on Ground) event, an engine issue, damage that must be assessed and rectified before the aircraft flies. Overhaul is the deep periodic work, typically at engine or component TBO (time between overhaul), where a unit is disassembled, inspected, and rebuilt to zero-time tolerances.
For buyers — flight departments, fleet managers, charter directors — the MRO choice is a procurement decision built on approvals and scope: which airframes the shop is rated for, which engine OEM programmes it holds (Pratt & Whitney, GE, Rolls-Royce), how quickly it can turn an AOG, and what its parts sourcing looks like. Capability pages that state airframe ratings, engine authorisations, and response windows in plain terms consistently outperform generic 'we service all makes' pages in both search visibility and enquiry quality.
For MRO operators themselves, the marketing problem is usually discoverability rather than capability: the approvals are real, but they live in PDF capability lists that buyers and search engines cannot find. The operators winning maintenance search visibility publish capability by airframe type and interval — the same structure buyers use to shortlist.