British Airways PLC has found no evidence of volcanic ash in its engines during recent weeks, Chief Executive Willie Walsh said. Since European skies were reopened on April 20, following a six-day closure due to the eruption of an Icelandic volcano, BA has operated more than 20,000 flight segments and conducted more than 8,000 engine inspections, Mr. Walsh said. “Not only have we not found any damage from ash, we have not found any ash,” Mr. Walsh said in an interview.