How much does the titanium 'bathtub' that protects the A-10's pilot weigh?

The A-10's cockpit and parts of the flight control systems are protected by 1,200 lb (540 kg) of titanium aircraft armour. This armour is made up of titanium plates whose thickness varies between 0.5 and 1.5 inches, equivalent to 13 and 38 mm.

The Thunderbolt II's airframe was designed around the high-powered 30 mm GAU-8 Avenger rotary autocannon. The complete weapon assembly, properly called the A/A 49E-6 Gun System, accounts for roughly 17 % of the aircraft's empty weight. The gun alone weighs 620 lb (280 kg), while the complete weapon, with feed system and drum, reaches 4,029 lb (1,828 kg) with a full ammunition load. Its rate of fire was originally selectable, 2,100 or 4,200 rounds per minute, and was later fixed at 3,900. The PGU-14/B armour-piercing incendiary round weighs about 14.0 oz (395 g). With armour-piercing incendiary ammunition, the muzzle velocity is 1,013 m/s.

The two YA-10 prototypes were built at Republic's plant in Farmingdale, New York, and first flew on 10 May 1972 with Howard "Sam" Nelson at the controls. Northrop's YA-9 fully met the USAF requirements, but on 18 January 1973 the YA-10 was declared the winner. Among the factors cited, the Air Force may have preferred the YA-10's already established TF34 to the untested F102, and Fairchild had no alternative work and was unlikely to survive without the A-X contract.