Subject: Round trip Flight times vary !!!

When we fly from the West to east over the pacific ocean it takes about 22 
hours to reach destination (eg. California to Bombay over pacific ocean), but 
takes 17 hours back. Is it because when flying from CA to India the direction 
of flight is the same as direction of earth rotation around it's own axis, so 
it takes longer to reach the destination cause the destination is moving 
further away from the plane and the plane is trying to catch the destination ? 
And when flying back the flight direction is opposite to the earth's rotation 
about it's axis. And both the airplane and the destination are coming towards 
each other.
Well of course the head winds and the tail winds do play quite some role in it. 
But I guess the major factor is the earth's rotation with respect to the flight 
direction.
Pl. let me know ...
Thanks,

Re: Round trip Flight times vary !!!