How do you build a two seated airplane?

When 767 sales weakened in the face of competition from the Airbus A330-200 in the late 1990s, Boeing began to consider a replacement. As the Boeing 747-400 was also beginning to lose traction, the company proposed two new aircraft — the Sonic Cruiser and the 747X. The Sonic Cruiser was intended to achieve higher speeds (approximately Mach 0.98) while burning fuel at the same rate as the existing 767 and A330 products. The 747X, intended to compete with the Airbus A380, would have stretched the 747-400 and had a composite supercritical wing to improve efficiency. The limited potential market for superjumbos was an issue, however; the earlier Douglas DC-10 and Lockheed L-1011 widebodies split a similarly limited market and drove both companies out of their strong positions in the commercial aircraft market.