Staying within the airport itself landside there are not a great deal of areas ideal for spotting. Inside the terminal close to domestic arrivals there are views of the apron and mainly of Sat 1 and part of Sat 2. This is a better area to be watching as Sat 3 is all Ryanair and once you have seen 10 FR jets it gets boring. From the domestic arrivals area you will see the usual airlines such as Eos Airlines, Maxjet, easyJet the several charters, CSA, Germanwings, El Al depending on what time you are there and many more. If you also walk out of the terminal you can get better views of the same area. Unfortunately there is no dedicated viewing area.