Thank you The Bess. I did find some values for domestic flights between the Prairie cities, although, 1998 is the survey year (passenger values have increased since, to varying degrees for each city).
Direct PDF download
here
Source page
here
I am primarily interested in these figures to understand the relationship between cities as expressed through passenger flows, and when we could expect implementation of a high speed rail network as an alternative to air travel.
After a quick review of the fight patterns between the Prairie cities, I have come to the conclusion that we will not pursue high speed rail service for the foreseeable future.