The design team at Boeing was finalizing the Sonic Cruiser configuration throughout 2002.[22][23] Wind tunnel testing and computational fluid dynamics analysis were used to refine the Sonic Cruiser concept.[24] Based on artwork released by Boeing in July 2002, the Sonic Cruiser now sported two taller vertical tails with no inward cant, and the forward canard was set at zero degrees dihedral.[22] By that time, three different designs had been advanced: one was the original canard-delta wing design, and two were more conventional mid-fuselage wing designs in the interest of better compatibility with existing airport jetway equipment, although those two designs were unable to offer the same performance as the original configuration.[4]