|  A1 | Amateur | 
|  A2 | Air Transport Rating (ATR) | 
|  A3 | Airplane | 
|  A4 | American Motorcyclist Association (AMA) | 
|  A5 | American Powerboat Association (APBA) | 
|  B1 | Boeing 747 | 
|  D1 | Deep Water Diver Club | 
|  D2 | Diving Advanced Open Water Certification | 
|  D3 | Diving Open Water Certification | 
|  D4 | Diving Rescue Diver Certification | 
|  D5 | Diving Underwater Hunter Certification | 
|  F1 | Federal Aviation Administration Medical Class 1 | 
|  F2 | Federal Aviation Administration Medical Class 2 | 
|  F3 | Federal Aviation Administration Medical Class 3 | 
|  G1 | Glider | 
|  I1 | Instructor | 
|  I2 | International Motor Sports Association (IMSA) | 
|  I3 | Instrument | 
|  I4 | Instrument Flight Rating Airplane | 
|  I5 | Instrument Flight Rating Helicopter | 
|  L1 | Lighter Than Air | 
|  M1 | Multiengine Land | 
|  M2 | Multiengine Sea | 
|  N1 | National Association Stock Car Auto Racing (NASCAR) | 
|  N2 | National Hot Rod Association (NHRA) | 
|  P1 | Professional | 
|  R1 | Rotorcraft | 
|  S1 | Student | 
|  S2 | Sports Car Club of America (SCCA) | 
|  S3 | Single Engine Land | 
|  S4 | Single Engine Sea | 
|  U1 | United States Auto Club (USAC) | 
|  V1 | Visual |