I'm not in the miles parsha, so I'm over my head, to use mmgfarb's whimsical image. So not commenting on the specifics, but rather on the general essay:
It seems to be author-centered - I analyzed this, I tabulated that, etc, rather than reader-centered - Here's why you, the reader, should be interested in this. As it is now, it seems to me that it would be of interest only to someone who wants to travel from Boston to London on the dates given, which is probably a small number of your readers.
I assume that after doing all this research, you can draw some general conclusions, and those conclusions are what I would expect to see in the introduction, to convince the reader why it's worth reading further. I'm not sure what those conclusions would be, but perhaps one of these would at least give you an idea:
a. I discovered that there are huge, unpredictable differences when using different miles cards, so expect to spend ___ hours to calculate what will work best for your particular trip.
b. There are relatively trivial differences in using miles for economy fares, so you maybe you should just pay the fare and save the miles for when you want to splurge on Business class.
c. Buying one way tickets often saves you money, but only if you're flying business class.
I don't know if any of these makes sense, but I feel like some generalization like this is needed to make it clear why this should be interesting to anyone who is not flying that particular route on that particular day.