a retention system includes a base supporting a wing spar and a post extending through the base from a first side of the base to a second side of the base . the post inserts through an aperture in the spar . a stop is selectively securable to the post over the second side of the base . a locking member engages the post on the first side of the base . the locking member is configured to selectively move the post from an unlocked position to a locked position in which the post is withdrawn toward the first side relative to the unlocked position . a biasing member encircles the post and is positioned between the stop and the second side . when the locking member is in a closed position the biasing member expands to engage the aperture and resist movement of the wing spar . a plurality of cradles may support the wing .