Coast Guard searching for missing medical plane carrying 6 people

Flight data shows the jet dropped at least 9,000 feet over two minutes, then leveled off for several more minutes, before disappearing.

<img src='https://npr.brightspotcdn.com/dims3/default/strip/false/crop/2000x1125+0+1053/resize/2000x1125!/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2F96%2F68%2F3cd5cd0e4f478da191737c99f3b6%2Fgettyimages-2286149812.jpg' alt='The U.S. Coast Guard says it has deployed a helicopter, like this one pictured in July, as well as two search and rescue planes and a motor lifeboat to search for the plane that disappeared Saturday off the coast of Massachusetts.'/><p>Flight data shows the jet dropped at least 9,000 feet over two minutes, then leveled off for several more minutes, before disappearing.</p><p>(Image credit: Heather Diehl)</p><img src='https://media.npr.org/include/images/tracking/npr-rss-pixel.png?story=g-s1-146338' />