1 We usually fly in aeroplane.
2 But there are different kinds of machines for flying in.
3 The general term for machines we fly in is aircraft.
4 The types most people use for travel are called passenger aircraft.
5 Similar aeroplanes are used for transporting goods.
6 These we term as transport aircraft.
7 Helicopters are used by both the military and by private citizens.
8 However, some aircraft are only used by the military.
9 The military is the army, navy and airforce.
10 Not just the airforce use aircraft.
11 Most military aircraft are used for fighting or defense.
12 Many, however, are used for transport.
13 These provide food etc. for the armed forces.
14 Some aircraft fly from ships called aircraft carriers.
15 Even space rockets can be called aircraft.