A method of constructing a cured composite assembly, comprising: positioning a composite assembly within a bonding tool (380,700), wherein the composite assembly comprises: an upper skin assembly (350,460,560,660) extending between a leading edge (300a,650a) and a trailing edge of the composite assembly and comprising an integrally formed upper spar key (356,662); a lower skin assembly (360,470,570,670) extending between the leading edge (300a,650a) and the trailing edge and comprising an integrally formed lower spar key (366,672); an uncured composite spar (310,480) disposed between the upper skin assembly (350,460,560,660) and the lower skin assembly (360,470,570,670); and a core (320,490,610) disposed between the upper skin assembly (350,460,560,660) and the lower skin assembly (360,470,570,670) and aft of the spar (310.480); wherein the upper spar key (356,662) of the upper skin assembly (350,460,560,660) comprises a flanged portion that extends towards the lower skin assembly (360,470,570,670) and the lower spar key (366,672) of the lower skin assembly (360,470,570,670) comprises a flanged portion that extends towards the upper skin assembly (350,460,560,660), and wherein the upper spar key (356,662) and the lower spar key (366,672) are disposed aft of the spar (310,480) and fore of the core (320,490,610); and performing a curing cycle on the composite assembly to simultaneously cure the uncured composite spar (310,480) and bond the upper skin assembly (350,460,560,660) and lower skin assembly (360,470,570,670) to the cured composite spar. positioning a composite assembly within a bonding tool (380,700), wherein the composite assembly comprises: an upper skin assembly (350,460,560,660) extending between a leading edge (300a,650a) and a trailing edge of the composite assembly and comprising an integrally formed upper spar key (356,662); a lower skin assembly (360,470,570,670) extending between the leading edge (300a,650a) and the trailing edge and comprising an integrally formed lower spar key (366,672); an uncured composite spar (310,480) disposed between the upper skin assembly (350,460,560,660) and the lower skin assembly (360,470,570,670); and a core (320,490,610) disposed between the upper skin assembly (350,460,560,660) and the lower skin assembly (360,470,570,670) and aft of the spar (310.480); wherein the upper spar key (356,662) of the upper skin assembly (350,460,560,660) comprises a flanged portion that extends towards the lower skin assembly (360,470,570,670) and the lower spar key (366,672) of the lower skin assembly (360,470,570,670) comprises a flanged portion that extends towards the upper skin assembly (350,460,560,660), and wherein the upper spar key (356,662) and the lower spar key (366,672) are disposed aft of the spar (310,480) and fore of the core (320,490,610); and performing a curing cycle on the composite assembly to simultaneously cure the uncured composite spar (310,480) and bond the upper skin assembly (350,460,560,660) and lower skin assembly (360,470,570,670) to the cured composite spar. an upper skin assembly (350,460,560,660) extending between a leading edge (300a,650a) and a trailing edge of the composite assembly and comprising an integrally formed upper spar key (356,662); a lower skin assembly (360,470,570,670) extending between the leading edge (300a,650a) and the trailing edge and comprising an integrally formed lower spar key (366,672); an uncured composite spar (310,480) disposed between the upper skin assembly (350,460,560,660) and the lower skin assembly (360,470,570,670); and a core (320,490,610) disposed between the upper skin assembly (350,460,560,660) and the lower skin assembly (360,470,570,670) and aft of the spar (310.480); wherein the upper spar key (356,662) of the upper skin assembly (350,460,560,660) comprises a flanged portion that extends towards the lower skin assembly (360,470,570,670) and the lower spar key (366,672) of the lower skin assembly (360,470,570,670) comprises a flanged portion that extends towards the upper skin assembly (350,460,560,660), and wherein the upper spar key (356,662) and the lower spar key (366,672) are disposed aft of the spar (310,480) and fore of the core (320,490,610); and performing a curing cycle on the composite assembly to simultaneously cure the uncured composite spar (310,480) and bond the upper skin assembly (350,460,560,660) and lower skin assembly (360,470,570,670) to the cured composite spar.