NEW : Rescue teams from U.S. , Israel , Turkey find people alive in quake rubble . NEW : Nearly 30 teams from around the world continue to search debris for survivors . The secretary - general visits Haiti , site of U.N. 's worst loss of life ever . Port - au - Prince airport remains overwhelmed by planes bringing supplies .
NEW : Rescue teams from U.S. , Israel , Turkey find people alive in quake rubble . NEW : Nearly 30 teams from around the world continue to comb debris for survivors . U.N. secretary-general visits Haiti , site of U.N. 's worst loss of life ever . Port-au-Prince airport remains overwhelmed by planes bringing supplies .