 The cast often had to fly to remote shoot locations by helicopter.  Sean Bean (qv) (Boromir) was afraid of flying and would only do it  when absolutely necessary. When they were shooting the scenes of the  Fellowship crossing the snowy mountains, hed spend two hours every  morning climbing from the base of the mountain to the set near the  top, already dressed as Boromir. The crew being flown up could see  him from their helicopters.