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So, on DFW-ATL right now, airlines have 1500% and 1400% market share

http://beta.airline-...1=DFW&city2=ATL

OK, I think I see the issue we're running into, after some investigation. Airline Empires appears to use total passenger traffic to rank and list airports, not enplanements.

However, the FAA only provides enplanement data.

The only source of "total passenger traffic" that I can find is the ACI, and their full report costs 500 euros! http://www.aci.aero/...47^2003_725_2__

Otherwise, only the top 30 airports have ACI information publicly available. http://www.airports....5-10812_666_2__

For U.S. airports, I think doubling enplanement data will provide the best rough estimate that we can come up with.

This post will contain a list of U.S. airports with known incorrect passenger counts.

Data is based on one of two sources:

Airports Council International 2010 Total Passenger Count - http://www.airports....5-10812_666_2__ - for the airports for which that is available

FAA 2010 Enplanement Data - http://www.faa.gov/a...nplanements.pdf - doubled, for all other airports.

Differences of a couple thousand here and there are ignored... only focusing on the airports that are significantly off by large percentages.

ATL - Atlanta - should be 89,331,622
ORD - Chicago O'Hare - should be 66,774,738
LAS - Las Vegas - should be 39,757,359
SFO - San Francisco - should be 39,253,999
PHX - Phoenix - should be 38,554,215
CLT - Charlotte - should be 38,254,207
ROA - Roanoke - should be 632,956 - (this is a high priority, because it's currently in-game at well over 5 million!)

Charleston, West Virginia - CRW, Yeager Airport... listed as over 2 million passengers. Actual 2010 enplanements were 264,000.

FSD - Sioux Falls Regional Airport, listed as 1.4 million - should be 385,000, per stats on the airport Web site.

http://www.sfairport.com/stats.php

-your friendly "developing a route to just about every airport in North America" Airline Empires user