http://avherald.com/h?article=43992f42

An Air Canada Boeing 777-300, registration C-FIVS performing flight AC-91 (dep Mar 12th) from Sao Paulo Guarulhos,SP (Brazil) to Toronto,ON (Canada), was enroute at FL360 about 110nm south of San Juan (Puerto Rico) when the crew began their descent diverting to San Juan because of a medical emergency on board. The airplane landed safely on San Juan's runway 08 about 17 minutes later.

A passenger on board reported that a doctor was called out for a man who had collapsed in his seat. Some time later another announcement indicated they were diverting to San Juan because the man was suffering from a pulmonary collapse.

The aircraft reached Toronto with a delay of 2:15 hours.