Which heavy maintenance shops are known for FAA and EASA certified work on major airframes?

Several heavy-maintenance MRO shops are widely recognized for performing FAA- and EASA-certified work on major commercial airframes. “Known for” can vary by region and aircraft type, but these are among the more established names:

Major global / multi-aircraft MROs

• Lufthansa Technik — Strong reputation for line and heavy maintenance, modifications, and component support across Airbus and Boeing fleets.
• AFI KLM E&M (Air France Industries / KLM Engineering & Maintenance) — Major heavy-maintenance capability with FAA/EASA approvals and broad widebody/narrowbody experience.
• SR Technics — Well known in Europe and the Middle East for airframe, engine, and component services.
• Swissport / Jet Aviation Maintenance — More focused on business aviation and special-mission aircraft, but with certified maintenance capability.

Large airframe heavy-maintenance specialists

• AAR Corp. — Significant MRO footprint in the U.S. with FAA and EASA capabilities, especially on commercial narrowbody and regional aircraft.
• ST Engineering Aerospace — Major player in heavy maintenance and conversions, especially for Airbus and Boeing narrowbody/widebody platforms.
• HAECO — Global MRO group with strong heavy-maintenance operations and multiple regulatory approvals.
• Hong Kong Aircraft Engineering Company / Taikoo (Swire group) — Especially strong in widebody maintenance.
• SIA Engineering Company — Known for widebody and component support with international approvals.

U.S.-based heavy maintenance operators

• Delta TechOps — Large FAA-certified maintenance organization with broad fleet support and substantial heavy-maintenance depth.
• United Airlines MRO / United Services — FAA-certified, with heavy-maintenance experience on the airline’s fleet and third-party work in some cases.
• Southwest Airlines Technical Operations — FAA-certified, though mostly focused on its own fleet.
• HAECO Americas — U.S.-based heavy-maintenance provider with FAA/EASA approvals.

Notable regional heavy-maintenance providers

• Joramco (Jordan) — One of the best-known MROs in the Middle East for Airbus/Boeing heavy checks, FAA/EASA approved.
• Airbus Maintenance sites such as Airbus BizLab/MRO networks and partner facilities — particularly for Airbus airframes, though approvals vary by site.
• GAMECO (China Southern / Airbus-JV heritage) — Strong heavy-maintenance capability with international approvals.
• Avion Express / SmartLynx / other ACMI-linked MROs often use approved third-party heavy shops, but their own core maintenance capabilities vary.

If you’re looking for “major airframes” specifically

The most commonly cited major airframe heavy shops for Airbus A320-family, A330, A340, A350, Boeing 737, 777, 787 work include:

• Lufthansa Technik
• AFI KLM E&M
• ST Engineering Aerospace
• HAECO / HAECO Americas
• Delta TechOps
• AAR
• Joramco
• SR Technics
• SIA Engineering
• GAMECO

Important note

FAA/EASA certification is usually site-specific and capability-specific, not just company-wide. A company may be certified for:

• certain aircraft types,
• certain maintenance levels (C-check, D-check, structural repair),
• specific engine/APU/component work,
• specific ratings under FAA Part 145 and EASA Part-145.

If you want, I can also give you:

1. a ranked list by reputation for widebody heavy checks,
2. a U.S.-only / Europe-only / Middle East-only list, or
3. a table with aircraft types and approvals.