I can feel the side eye that you all are giving me right now. Carrie was on a flight from London to LA, he has been on a book tour the last few weeks. When they were about 15 minutes away from LAX, Carrie began having issues. The stewardess asked if anyone worked in the medical field and luckily there was a paramedic. The paramedic performed "life saving procedures" and was able to keep her alive until the landed. An ambulance was waiting for her and she was rushed off to a nearby hospital.
This is a breaking and developing story, as more updates become available I will update the story.
TMZ was the first with the story, of course. http://www.tmz.com/2016/12/23/carrie-fisher-heart-attack-plane/