Personally, I have to believe that it was. Otherwise, why would the conspirators go to all the trouble of pulling off the assassination in broad daylight with hundreds of witnesses, some with cameras and movie equipment? Wouldn't it have been easier to simply explode his plane, or have one of his call girls take care of it and leave by the back door?
I'll use this page to post links to others who have had more time and experience researching this possibility.
Here's one from Prison Planet, although you will have to scroll down to find the article.
This one is heavy indeed, but I'm not convinced it tells the whole story.
Here's an interesting post on Aferrismoon blog investigating all sorts of occult connections to the JFK slaying and what the author believes are related events.
Especially interesting is the blog author's pointing out the likely occult significance of having these two women, clad in the occult death colors of red and black, appear at the kill zone as perhaps gateposts or signposts. See another example of the occult use of red and black below:
See the AFERRISMOON post for more examples. Also, be sure to read the comments as there are intriguing ideas presented there as well.