No, he did not invent popcorn. He has nothing to do with popcorn.
Eddie Rickenbacker was the leading WWI Ace of the United States Army Air Force. In the deadly skies over Europe, in first a Nieuport 28 and then a Spad XIII, Rickenbacker has 27 confirmed air victories on record and flew more than 300 hours, the most of any American during the war.
A stunning feat, and certainly laurels enough upon which one could rest. But after WWI, Rickenbacker first promoted Liberty Bonds, then started his own automobile company (that didn't make it), but went on to get involved with Eastern Air Transport and then Eastern Airlines, which he ran successfully during the golden age of air transport.
He would be 122 today.