In the novella, there is no wind, not even a light breeze when they are in Bangor. Since this was virtually impossible to execute for the movie they simply created dialogue to explain that even with a wind down here the clouds are not moving.
The aircraft used in the movie (Lockheed L-1011-385-1 TriStar (Reg No. N31018)), first flew on 10/02/1974, and was delivered to Trans World Airlines on 23/03/1974. Following filming of The Langoliers, the aircraft was re-registered as SE-DSC, and sold to Air Ops of Sweden (delivered 18/03/1995). It was broken up for scrap at Bournemouth, UK, 1996.
The trivia item below may give away important plot points.
The Langoliers themselves were originally going to be portrayed by puppets, but we're replaced with CGI instead. Unfortunately, the poorly rendered and animated monsters ended up looking laughably hokey, and are regarded as some of the worst CGI effects ever.