In the United States the Federal Aviation Administration requires flight attendants on aircraft with 20 or more seats to hold a Certificate of Demonstrated Proficiency. This is not considered to be the equivalent of an airman certificate (license), although it is issued on the same card stock. It shows that a level of required training has been met. It is not limited to the airline at which the attendant is employed (although some initial documents showed where the holder was working), and is the attendant's personal property. It does have two ratings, called Group I and II. Either or both of these may be earned depending upon the type of aircraft (propeller or turbofan) on which the holder has trained.