We usually flyaeroplane. 2 But there are different kindsmachinesflying in. 3 The general termmachines we fly inaircraft. 4 The types most people usetravel are called passenger aircraft. 5 Similar aeroplanes are usedtransporting goods. 6 These we term as transport aircraft. 7 Helicopters are used by bothmilitaryby private citizens. 8 However, some aircraft are only used bymilitary. 9 The militarythe army, navyairforce. 0 Not justairforce use aircraft. Most military aircraft are usedfighting or defense. 2 Many, however, are usedtransport. 3 These provide food etc.the armed forces. 4 Some aircraft fly from ships called aircraft carriers. 5 Even space rockets can be called aircraft.