A US marine survey firm that resumed the search for a missing Malaysia Airlines Boeing 777-200 early this year said May 29 it is concluding the operation. In just over three months, Houston-based Ocean Infinity searched and collected data from 112,000 sq km (43,243 sq miles) of ocean floor in the southern Indian Ocean. That was nearly the same area the previous search for the aircraft covered in two-and-a-half years, the company said.