Earlier quoted context omitted.
Also true for the Caltrain, coffee shops, and nicer restaurants between SF and SJ. And SFO, SJC, and SEA airports; I think I hear some salesman loudly talking about a deal almost every time I fly out of those places on weekdays.
Fun fact: Using knowledge gained in this way isn't insider trading[1]. Conceivably a person could even sell tips based on information heard in public places to traders. During the golden age of Wall Street, this was extremely common. Traders or their lackeys would visit businesses (or the bars near them) and pump employees for info. [1] Not a lawyer, not legal advice.
It is not insider trading if you get it by simply overhearing a public conversation.