Edelson Lechtzin Investigates STS Aviation Group Breach Affecting 319 Massachusetts Residents

Edelson Lechtzin LLP is investigating potential class action claims against STS Aviation Group over a data breach that exposed Social Security numbers, financial and medical data, the firm said in a PR Newswire announcement. The breach has so far been reported to affect at least 319 Massachusetts residents.

Edelson Lechtzin's Investigation Into the STS Aviation Group Breach

STS Aviation Group disclosed that, on or around August 5, 2025, an unauthorized third party accessed certain of its computer systems, according to the PR Newswire announcement. The company identified the incident on September 12, 2025, and began working to determine its scope and the individuals affected. On September 19, 2026, STS Aviation Group determined that the unauthorized party had obtained personal information belonging to affected individuals.

STS Aviation Group reported the breach to the California, Massachusetts, and Vermont Attorneys General on October 19, 2026, and began notifying affected individuals the same day. The personal information involved may include names and contact information, dates of birth, government identification documents and numbers, login credentials, financial account information and payment card details, medical information and health insurance information, fingerprints, and work-related information such as salary, evaluations, and workers' compensation claims.

Edelson Lechtzin is a national class action law firm with offices in Pennsylvania and California. The firm said it is investigating a potential class action on behalf of individuals whose data may have been compromised, and that it evaluates rights and potential claims at no cost. Marc Edelson, Esq., is named as the contact for confidential case evaluations.

STS Aviation Group's Aviation Services Business

STS Aviation Group is a private-equity-backed aerospace maintenance, repair and overhaul company founded in 1984 and headquartered in Jensen Beach, Florida, according to akta.pro company records. The company provides aircraft maintenance, line services, engine repair, parts distribution, engineering, defense solutions, and workforce staffing to commercial airlines, military operators, and OEMs. Its records list two funding rounds: a 2019 private equity round led by Greenbriar Equity Group and a 2024 private equity round led by H.I.G. Capital.

Other Data Breach Investigations

Edelson Lechtzin has recently announced similar investigations. On October 16, 2026, GlobeNewswire carried its probe of a reported ransomware attack on Medical Data Rx. On October 15, 2026, GlobeNewswire reported its investigation after JM Bullion disclosed a breach in which an unauthorized party accessed customer information between April 12 and 14, 2026.

What Comes Next for Notified Individuals

Affected individuals are receiving written notice describing the incident and the protections offered. The firm's announcement directs recipients to watch for the notice by mail and keep the enclosed activation code.