Akshay Kumar plays a RAW agent who successfully pulls off a covert operation in Dubai and frees all passengers on a plane hijacked by terrorists - many thanks to a timely sandstorm. (We later figure that his wife is also a RAW agent and he doesn't seem to know about it. That looked a bit dubious.) Anyway why Bell Bottom is the main question one is left with about the movie?
Apart from wearing bell bottoms and riding an old scooter RAW operatives never reveal their real names - the code name for this one - Bell Bottom.