Cabin Air Safety Act of 2019 This bill directs the Federal Aviation Administration (FAA) to implement regulations regarding smoke or fume incidents on commercial aircraft (excluding helicopters). Specifically, the bill requires flight attendants, pilots, aircraft maintenance technicians, airport first responders, and emergency response teams to receive annual training on how to respond to incidents involving smoke or fumes on board commercial aircraft; the FAA to develop a standardized form for reporting incidents involving smoke or fumes; the FAA to conduct an investigation after a report is submitted about incidents of smoke or fumes; and commercial air carriers to install and operate onboard carbon monoxide detectors.