The air you breathe on airplanes comes directly from the jet engines. Known as bleed air, it is safe, unless there is a mechanical issue. When that happens, heated jet engine oil can leak into the air supply, potentially releasing toxic gases into the plane. A Times investigation found that vapors from oil and other fluids seep into planes with alarming frequency across all airlines, at times creating chaos and confusion. Such events are documented in airport paramedic records, NASA safety reports, federal aviation records, and other filings reviewed by The Times.

Read Article: LA Times