The trial is expected to use satellite-based positioning technology already on board 90 percent of long-haul aircraft that transmits the plane's current position and its next two planned positions, said Airservices Australia chairman Angus Houston, who helped lead the search for Flight 370. There is no requirement for real-time tracking of commercial aircraft and ever since Flight 370 disappeared, air safety regulators and airlines have been trying to agree on how extensively planes should be tracked. An international team of experts who analyzed a series of hourly transmissions between the plane and a satellite later determined that the plane traveled for another seven hours before crashing somewhere within a remote 60,000 square kilometer (23,000 square mile) patch of the Indian Ocean.