http://www.npr.org/templates/story/story.php?storyId=113942431700UW said:The fourth line was in exchange for AMFA letting WN send work to Aeroman in San Salvador.
That scenario could have happened a few weeks ago on a US Airways flight, if an observant employee at the airline hadn't made a discovery: Mechanics who had just repaired the plane at the Aeroman repair company in El Salvador had, in fact, crossed the wires on two engine indicators in the cockpit. NPR obtained internal US Airways documents that describe the incident, and a senior company executive confirmed it.