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By J. W. Rutherford, V. F. Wells

Airplane layout 2 (1999) eighty one - ninety four

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Landing fees, merely represent a small part of all income sources. Non-aviation income sources, such as parking and real estate, often represent more than half of the total revenues (Graham 2003; Jarach 2005). g. infrastructure connections to other modes of transportation, lounges) is relatively high. Airports that mainly serve lowcost airlines, however, only provide a minimum of services. Due to their remote locations, ground infrastructure connections are usually poor. In contrast to the group of airports introduced above, these airports often generate losses and thus operate at the taxpayers’ expenses.

On the other side, long supply chains and procurement cycles often lead to over and under capacities. The time between the order of an airplane and the actual start of operations can take up to several years. Thus, an aircraft which has been ordered in an economic upturn often arrives in a recession and may even worsen this downturn (Wells and Wensveen 2004). Inversely, intended capacity growth due to increasing demand might not 2 Fundamentals and Structure of Aviation Systems 29 Fig. 7 Influence of external shocks on air travel in the long term (Source: Airbus 2009) completely be met, as there is only little possibility to respond quickly to increasing demand if airlines, which have been ordered, are not delivered in time (Joppien 2006).

2001). In general, the supply developed positively with rising demand. Between 1978 and 1988 the number of passengers increased by 88% and the kilometres flown by passengers rose by 62%. The supply, in form of available seat kilometres, rose by approximately 65% during the same period (Kennet 1993). Demand The consumers are often considered the real beneficiaries of deregulation because it resulted in lower flight prices. In fact, the prices sank by 22% on average between 1978 and 1993 (Morrison and Winston 1997).

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An air-launched, self-recovering autonomous vehicle concept by J. W. Rutherford, V. F. Wells

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