This is something that you need to be careful with-some airlines don`t mind people taking photos on board,but some are very strict about not allowing it.
Take off and landing shots seem to be the main bone of contention,as they sometimes consider a camera an electronic device,and therefore don`t allow their use during these phases.
Certainly I could understand if it was a cameraphone being used.
I took some video on a flight 5/2/2011 coming back from Rome to BFS over the Alps with Aer Lingus,but I asked first and was told it was OK.
Might upload it here if I can figure out how do it and if it`s any good