| Code | Wingspan | Outer main gear wheel span | Typical aeroplane |
|---|
| A | < 15 m | < 4.5 m | PIPER PA-31/CESSNA 404 Titan |
| B | 15 m but < 24 m | 4.5 m but < 6 m | BOMBARDIER Regional Jet CRJ-200/DE HAVILLAND CANADA DHC-6 |
| C | 24 m but < 36 m | 6 m but < 9 m | BOEING 737-700/AIRBUS A-320/EMBRAER ERJ 190-100 |
| D | 36 m but < 52 m | 9 m but < 14 m | B767 Series/AIRBUS A-310 |
| E | 52 m but < 65 m | 9 m but < 14 m | B777 Series/B787 Series/A330 Family |
| F | 65 m but < 80 m | 14 m but < 16 m | BOEING 747-8/AIRBUS A-380-800 |
