LONDON (Dow Jones)--BP PLC's (BP) Chief Executive Tony Hayward said Tuesday he is confident that the leaking Macondo well in the Gulf of Mexico has been permanently sealed by the cap installed on the well on July 16. Boats and airplanes participating in the cleanup operations are finding it increasingly difficult to locate oil on the surface of the Gulf of Mexico, he said at a conference for analysts in London. -By James Herron, Dow Jones Newswires; +44 (0)20 7842 9317; james.herron@dowjones.com (END) Dow Jones Newswires July 27, 2010 09:47 ET (13:47 GMT)