Have been flying a lot lately and have questions for any flight attendants out there. Whats the one ding or two ding bell signal. One ding appears to be the flight attendant call button. Two dings seem to indicate immediate take off or final approach. I was on a 757 the other day and there was a row of lights near the galley entrance over the aisle. Red on one side, blue in middle, and yellow or orange on the other side. What do these lights mean? Just interested to know. Don't want you to give away any secrets.