NEW : Pilots ' failure to issue mayday `` ominous sign , '' former NTSB spokesman says . NEW : Memorial service to be held Wednesday at Paris ' Notre Dame Cathedral . Read more about victims on Air France Flight 447 . Comment: Flight 447 , traveling from Rio de Janeiro to Paris , was carrying 228 people .
NEW : Pilots ' failure to issue mayday `` ominous sign , '' former NTSB spokesman says . NEW : Memorial service to be held Wednesday at Paris ' Notre Dame Cathedral . Comment: Flight 447 , traveling from Rio de Janeiro to Paris , was carrying 228 people .