It is possible to hide an aircraft in plain sight. Ask most people how many four engined aircraft Airbus has produced and the typical answer is two; the A340 and the A380. The correct answer is three, the differences between the A340-200/300 and A340-500/600 are such that they are by any standards different aircraft, despite similar appearances. Compared to the baseline A340-200/300, the A340-500/600 has: Newer, larger, heavier, more efficient and more powerful engines from a different supplier. A new wing of increased span, sweep and area. Enlarged vertical and horizontal tailplanes. Modified landing gear with extra wheels. Fuselage lengthened Continue Reading