Is there any way to tell what the internal designations of an airline mean? Looking at Delta's seat maps for the 757, Delta has a couple of kinds, but what's the difference?
Boeing 75A Boeing 75M Boeing 75S Boeing 75G
I know they're slightly different configurations for different routes, over water etc, but can what type is used on what route/configuration or what the designations mean be found somewhere?
Is there a place where these are defined for airlines of the world?