Aircraft structure

A method of manufacturing an aircraft structure comprising the following steps:

• providing a first sub-structure,
• providing a second sub-structure,
• placing a first end region of the first sub-structure adjacent the second end region of the second sub-structure, such that the end regions of the first and the second sub-structures overlap,
• providing at least one additional structural element so that both sub-structures have box cross-sections and so that the box cross-section of the first sub-structure is inside the box cross-section of the second sub-structure,
• joining the first and second sub-structures together in the overlap region, and
• wherein each box cross-section of the sub-structures has four sides formed from one or more structural elements, and
• wherein on one or both of the sub-structures, extended portions of one or more structural elements extend further than the box cross-sections.