A high-speed transport aircraft. In one embodiment, the aircraft includes a fuselage, delta wings, and integrated engine nacelles. The fuselage is configured to carry a payload and has a forward portion and an aft portion. The aft portion defines a generally constant-width planform and includes first, second, third, and fourth passenger seat sections, with each of the seat sections having at least two passenger seats positioned abreast at least generally normal to a longitudinal axis of the fuselage. In one aspect of this embodiment, the wings extend from the fuselage adjacent to the aft portion, and the fuselage further includes first and second rows of windows above the wings. The first row of windows are positioned in the fuselage directly adjacent the first seat section and the second row of windows are positioned in the fuselage directly adjacent the fourth seat section.