Final answer:
The passengers and crew of Flight 93 learned about the other hijacked planes through airfones.
Step-by-step explanation:
The passengers and crew of Flight 93 learned about the other hijacked planes through airfones.
After the hijackers took control of the plane, some of the passengers and crew were able to make phone calls using the airfones.
Through these calls, they were informed about the attacks on the World Trade Center and the Pentagon as well as the other hijacked planes.
Learn more about Communication on Flight 93