UNITED STATES, Aug. 19 (Nationwide Times) — A job in commercial aviation does not mean a person will develop cancer. But a new study found that pilots and flight attendants had the highest shares of deaths from a group of cancers linked to radiation among 503 occupations in the United States.
The finding may be most relevant to people who work in aviation for many years. It does not show that flying caused any individual’s cancer, and it does not provide a personal cancer-risk estimate for a pilot, flight attendant or passenger.
What did the study find?
The study, published Aug. 17, 2026, in JAMA Internal Medicine, examined nearly 13 million U.S. death certificates from 2020 through 2024. The records covered about 503 occupations, including roughly 14,000 pilots and 7,000 flight attendants, according to Harvard Medical School’s summary of the research.
Among deaths recorded for flight attendants, 6.9% were linked to cancers in the study’s radiation-related category. The figure for pilots was 6.7%. Those were the two highest proportions among the occupations studied.
The researchers also found statistically significant increases in mortality from breast cancer, central nervous system cancers, prostate cancer and melanoma among pilots and flight attendants. Pilots also had higher mortality from leukemia, according to reports on the study’s findings.
The cancer group included breast cancer, melanoma, leukemia other than chronic lymphocytic leukemia, lymphoma, multiple myeloma, central nervous system cancers, thyroid cancer, prostate cancer and non-melanoma skin cancers.
These percentages describe the share of deaths in each occupation that fell into the study’s cancer categories. They are not the odds that a person currently working in one of these jobs will die from cancer.
Why might aviation workers have more exposure?
At commercial flight altitudes, workers are exposed to cosmic radiation, which comes from space and passes through the atmosphere. The Centers for Disease Control and Prevention estimates cited in coverage of the study put annual exposure for U.S. airline workers at about 3 to 6 millisieverts, a unit used to measure radiation dose.
For comparison, about 10 round-trip cross-country flights would result in an estimated exposure of roughly 0.4 millisieverts, according to the cited CDC comparison. Passengers generally take far fewer flights than airline employees, so the study’s findings should not be read as evidence that occasional air travel carries the same exposure as aviation work.
Harvard senior author Anupam Jena said the results support considering “occupational radiation protections for U.S. aircrew members commensurate with their level of exposure.” The study does not establish what specific protections should be adopted.
What the study cannot prove
The research was observational. That means it identified a pattern in existing records but could not prove that cosmic radiation caused the higher cancer mortality.
The available summary does not show whether the records captured a person’s current or lifetime occupation. It also does not provide details on individual flight hours, radiation doses, smoking, or other factors that could affect cancer risk. The study’s full adjusted risk estimates and confidence intervals were not included in the available reports.
The researchers found that pilots and flight attendants had cancer mortality rates near the middle of the occupations studied for cancers classified as non-radiation-related. That pattern supports the study’s focus on radiation-related cancers, but it does not rule out other explanations.
How this fits into wider research
Occupation can affect cancer exposure in many ways, including contact with chemicals, sunlight, night-shift schedules and other workplace conditions. A separate study published in January 2026 in The Lancet Oncology examined nearly 500,000 cancer deaths among working-age U.S. adults from 2020 through 2023 and calculated age-adjusted mortality rates by sex for more than 400 occupations, according to the University of Washington School of Public Health.
That broader research, which included scientists from Ohio State University and the University of Washington, reinforces that cancer patterns can differ across jobs. But it does not determine why a particular worker developed cancer.
For people who fly occasionally, the aircrew study does not provide evidence that ordinary travel creates the same risk as years of occupational exposure. For aviation workers, the findings point to a workplace-health question: whether long-term exposure should be monitored more closely and whether additional protections are needed. The study itself supports further research rather than a conclusion that pilots or flight attendants face an immediate health crisis.
