@electronic{www.eurocontrol.int,
   title       = {EUROCONTROL - News}, 
   url         = {http://www.eurocontrol.int/corporate/public/site_preferences/display_news_list.html},
   biburl      = {https://puma.uni-kassel.de/url/10e3834ee262fe8385a699e37572c78e/benz},
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@electronic{www.airline-direct.de,
   title       = {Airline direct}, 
   url         = {http://www.airline-direct.de/},
   biburl      = {https://puma.uni-kassel.de/url/b64cb670b2a14f4720a5f451e74de666/stumme},
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@electronic{www.whichbudget.com,
   title       = {Cheap Flights from Budget Airlines with WhichBudget.com}, 
   url         = {http://www.whichbudget.com/},
   biburl      = {https://puma.uni-kassel.de/url/b422e2e6910d82ce2c9b966246db7bae/hotho},
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