Choose the most suitable word for each space.

Air-travel is the most modern form of ___(1)___ transport and it ___(2)___ in the 20th century. Millions of people use airplanes for a variety of reasons. It is also extremely expensive to ___(3)___ air-travel facilities. Some travel for business, others go on holiday ___(4)___ air and others use cargo planes to move their products from country to country very ___(5)___. Some courier companies now have their own fleet of planes ready to carry parcels and post more efficiently. There are different types of passenger services - some are cheap and provide a ‘no-frills’ service which is good for short journeys. Other airlines ___(6)___ passengers with a luxurious flying experience. Airports are getting busier and it is evident that ___(7)___ passengers and businesses than ever are using airplanes to get to their destinations.