If you want to access the data provided by Flightradar24, then all that you require is an internet connection and a device on which to view the data. The website can be viewed on a PC or laptop, or just as easily on a tablet or smartphone - a dedicated App is available for mobile devices. The only requirement is having Java and Flash activated on your browser, as these are required in order to display the interactive map.
A complicating factor is that of origin-destination control ("O&D control"). Someone purchasing a ticket from Melbourne to Sydney (as an example) for A$200 is competing with someone else who wants to fly Melbourne to Los Angeles through Sydney on the same flight, and who is willing to pay A$1400. Should the airline prefer the $1400 passenger, or the $200 passenger plus a possible Sydney-Los Angeles passenger willing to pay $1300? Airlines have to make hundreds of thousands of similar pricing decisions daily.