model limits/data limits

i want to add a bunch of notes that hyper-fixate on our model limits. one that came to mind we can speak about is how we are missing months of data in a single year. let's find some documentation that showcases how price fluctuates in industry for airlines in the months missing (and maybe coinciding with our date range as well). we can use this to discuss the model limits.

think of more.

issue #18 covers outliers which may help us build a model limit argument.