Transportation Security Administration (TSA)In an emergency, TSA representatives will work with Authority personnel and public safety to work the incident as well as maintain the security of the airport and processing of passengers through security screening.
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A doctor may not always be seated in the cabin on your flight, but most commercial airlines are aware that in-flight medical emergencies can happen (I've written about one or two such instances myself in my time at USA TODAY). Most carriers contract with on-the-ground experts in emergency medicine at altitude.
No Legal Duty, but Potentially an Ethical OneThe ethical duty stems from the fact that doctors and other medical professionals don't lose their training simply because they are off duty and out of uniform.
Pan-Pan, short for “possible assistance needed,” is used to communicate an urgent, but not emergency, situation over VHF radio, in the case of aviation, to air traffic control. Examples could include a recreational pilot getting lost, or perhaps needing to climb to a higher altitude to sort a problem out.
The Federal Aviation Administration (FAA) is the largest transportation agency of the U.S. government and regulates all aspects of civil aviation in the country as well as over surrounding international waters.
They're informed because air marshals are armed law enforcement officers. Whenever armed passengers such as police officers or air marshals are on a flight, they're introduced to the flight crew.