I'm traveling today and am totally amazed on the different conversations going on as I wait for my next flight. Right now I'm getting an unintended update from a real estate developer on the health and progress on three major projects, two here in the US and one in Italy.
I make it a habit never to do any business while traveling. When I worked at PC Week I used to get lots of scoops just by traveling from Logan. But if you must, go to a corner where no one is around, and use your inside voice. With a good headset, you can talk very quietly and be understood.
Or else run the risk of finding your trade secrets in the trade press.