Question: How would I know if I was exposed to a person sick with the coronavirus while traveling by plane?

Answer passage (source: CDC):
page_title: Travel: Frequently Asked Questions and Answers
section_headers: Air or Cruise Travel
What is the risk of getting COVID-19 on an airplane?
section_content: Because of how air circulates and is filtered on airplanes, most viruses and
other germs do not spread easily. Although the risk of infection on an
airplane is low, try to avoid contact with sick passengers, avoid touching
your eyes, nose or mouth with unwashed hands, and wash your hands often with
soap and water for at least 20 seconds or use hand sanitizer that contains at
least 60% alcohol.
Learn more about Exposure Risk During
Travel

Reviewer feedback on this answer:
It's a good, short answer on how likely you are to get the virus on a plane.
This answer is bad because it gives no insight as to how people can know if they were exposed to the virus. Therefore, this answer does not answer the question at all.

Reviewer ratings:
Acceptable
Bad

Answer passage (source: CDC):
page_title: Frequently Asked Questions: Funeral and Burial Services for American Indians and Alaska Natives
section_headers: Coronavirus Disease 2019 Basics
What is COVID-19?
section_content: Coronavirus Disease 2019 (COVID-19) is a new disease, and we are still
learning about how it spreads and the severity of illness it causes. The
virus that causes COVID-19 is believed to spread person-to-person between
people who are in close contact (being within about 6 feet) with one another.
Some people without symptoms may be able to spread the virus.
The virus likely spreads primarily through saliva or mucus droplets produced
when an infected person coughs, sneezes, or talks. This is somewhat like how
the flu (influenza) and other infections such as the common cold spread.
These droplets can land in the mouths or noses of people who are nearby or
possibly be breathed in. Droplets can remain on surfaces such as countertops
and doorknobs for hours to days.

Reviewer feedback on this answer:
The answer talks about how you might get the virus, but it doesn't mention planes at all.
This answer is bad because it only talks about how the virus spreads, but not how others can know if they were actually exposed to the virus. Therefore, the answer does not satisfy the question.

Reviewer ratings:
Could be Improved
Bad

Answer passage (source: CDC):
page_title: Travel: Frequently Asked Questions and Answers
section_headers: Air or Cruise Travel
What happens if there is a sick passenger on an international or domestic flight?
section_content: Under current federal regulations, pilots must report all illnesses and deaths
to CDC before arriving to a US destination. According to CDC disease
protocols, if a sick traveler is considered to be a public health risk, CDC
works with local and state health departments and international public health
agencies to contact passengers and crew exposed to that sick traveler.
Be sure to give the airline your current contact information when booking your
ticket so you can be notified if you are exposed to a sick traveler on a
flight.
Learn more about Contact Investigation

Reviewer feedback on this answer:
It only talks about what airlines are supposed to do if they know a passenger has the virus. It doesn't really answer the question.
This answer is excellent because it describes how the CDC handles information about sick travelers, and how they reach out to other passengers to let them know of possible exposures. Therefore, the answer is suitable to the question.

Reviewer ratings:
Acceptable
Excellent