For BMEP (I underlined DEN's O&D ranking): https://www.flydenver.com/about/pres...senger_traffic

In 2016, DEN saw a record-setting 58.3 million passengers
This ranks DEN as the third-fastest growing airport in the world, behind only Kuala Lumpur and Delhi
DEN as the sixth busiest airport in the U.S. and 19th busiest in the world (according to 2015 numbers. 2016 figures have yet to be released)
Approximately 65 percent of travelers at DEN are origination and destination (O&D) passengers, and 35 percent are connecting
Approximately 35 million annual domestic passengers are O&D passengers, making DEN the fourth-largest domestic O&D hub in the U.S.
International traffic at DEN accounts for approximately 2.2 million passengers annually – approximately 4 percent of the airport’s total passenger traffic