This article highlights the key issues of outsourcing in the field of airport ground services. Both airlines and airports have gradually started to outsource these services, following governmental decisions in several countries regarding the commercialization and privatization of airports. Our research was based on data available from different airports showing a general trend in service outsourcing. There are particular situations in which both the airports and airlines take measures for insourcing services, mainly those related to passengers’ security in today’s global security conditions with threats of potential terrorist attacks – even when this is known to be a more expensive method of doing business. Modern technology provides conditions in which it is possible to reduce the number of operators, controllers and other staff, which gives the same chance for insourcing and outsourcing. Our contribution provides a general idea of outsourcing applied to the air business. The company cannot do everything – specialisation and differentiation means that an enterprise may carry out its business better and cheaper and can thus offer this service to other enterprises.