Hi Vasu,
As Mhodgson says there are some very interesting movements, particularly cargo, unfortunately unless you have a car the place to view the cargo ramp is a very long walk away on the far side of the runway! The website at
http://aviation.mikemoro.com is very helpfull & if you go onto spotting guides on the left hand side it will show you all the vantage points & how to get to them! Whenever I visit here I always have high expectations of what I'm going to see here cargo wise,you just never know until you get here what will be on the ramp!
Luxembourg city is worth a visit if you've never been here, but I prefer to get out from the city & explore the rest of the country! For a small country it really has some very nice scenery & countryside to visit!
Dave(SAAB900)