How come I see some large planes, such as the 747, classified as either Category 5 or 6 Gate Sizes, depending on the publication. Why do some sites count the plane as one size, while others state otherwise? Is there a definitive guide, or is it relative to the country/airport?
I would believe that you are talking about Aircraft Design Group classification which is based off of aircraft wingspan and tail height. These classifications can also dictate what taxiways a certain model of airplane can use.
- Group I: Wingspan - Less than 49' (15m)
- Group II: Wingspan - Between 49' (15m) and 79' (24m)
- Group III: Wingspan - Between 79' (24m) and 118' (36m)
- Group IV: Wingspan - Between 118' (36m) and 171' (52m)
- Group V: Wingspan - Between 171' (52m) and 214' (65m)
- Group VI: Wingspan - Between 214' (65m) and 262' (80m)
PDF for list of Boeing Airplane Group classifications