American B763 near San Juan on Apr 11th 2014, fuelities

An American Airlines Boeing 767-300, registration N363AA performing flight AA-974 (dep Apr 10th) from Rio de Janeiro,RJ (Brazil) to New York JFK,NY (USA), was enroute at FL380 over the Caribbean Sea near San Juan (Puerto Rico) when an uncommanded fuel transfer from the right wing tank to the center fuel tank began, which could not be stopped by crew actions. About 120nm south of San Juan the crew therefore declared emergency and decided to divert to San Juan where the aircraft landed safely on runway 08 about 30 minutes after leaving FL380.

A replacement Boeing 767-300 registration N383AA was dispatched to San Juan, continued the flight and reached New York with a delay of 8.5 hours.