I understand the distinction between bombers and fighters in the medium airframe tree, but what distinguishes the three branches of the light airframe tree? And can medium and heavy airframes never get carrier capability? Can something like the Mustang get ground attack capability? It only has an air attack rating in the screen shot. Do heavier airframes have an "armor" rating? Are the names going to be rationalized? Some of the models have their numbers and names on the tech tree, some just have the names, and a few (B-17, XB-28) just have numbers. And if the XB-28 were to be mass produced, wouldn't it lose the XB designation?