A method and apparatus for an aircraft structure. In one embodiment, the aircraft structure may have first and second stringers, each having a vertical stringer portion defining a lengthwise gap. The embodiment may include a cruciform fitting having a central rib attachment member and first and second extensions extending in opposite directions from said central rib attachment member. Stringer attachment portions extending up from said first and second extensions are inserted into the lengthwise gaps of the first and second stringer portions, respectively. The rib attachment member may be attached to a side-of-body rib.