Lorie, it was not like a dial tone that I heard but a buzzing sound for a few seconds then stopped. It could appear for about 20 times a day. Sometimes I heard a sound like a door bell ring and I rushed to answer the door. In fact the sound didn't exist. Other than these, I didn't hear anything queer. As for flying, it is the air pressure that may have bad impact on hearing. I think the doctor should know better about what can be done to prevent further damage. My friend got some medicine before he flew to London but I have no idea what it is. He told me later that he didn't have problem flying in the plane for 12 hours. Just a precaution.

Karen.