From an O/D perspective, I'd say not. Plenty of O/D traffic in SFO and no doubt eclipses SEA. Last list of pure O/D traffic I saw had SFO at #5 and SEA at #14.

Nevertheless, LAX is #2, Miami #3 and Chicago #4. The new AA must be very happy with its current strategy. They have hubs in 50% of the top 10 cities, including the top 4. And from that perspective, UA has hubs in 4 of the 5 largest O/D markets. DL loses that game, as its mega-hub in ATL is #13; SEA #14, MSP #17. SLC? #25, the last one on the list.

And yet...DL is having record profits while UA stumbles repeatedly and loses $$. It's not all about O/D at the end of the day, clearly.

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Below is a list of the largest origin and destination airports in the US. This list does NOT include connecting traffic, only traffic originating for or destined to the airport(s) in question. The list includes international and domestic traffic. The list is for all airports in a metro area (ex. JFK, LGA, EWR, HPN for NYC/LAX, BUR, ONT, SNA for Los Angeles). The source of the data is the DOT annual report plus MDIT data. The data is listed in number of passengers per day. Top 25 markets are listed:

1) New York: 245,750 passengers per day
2) Los Angeles: 184,296
3) Miami: 131,265
4) Chicago: 127,776
5) San Francisco: 120,382
6) Washington DC: 120,201
7) Las Vegas: 91,114
8) Orlando: 89,108
9) Dallas: 83,053
10) Boston: 74,834
11) Houston: 71,060
12) Phoenix: 67,863
13) Atlanta: 61,943
14) Seattle: 60,539
15) Denver: 54,610
16) Philadelphia: 49,178
17) Minneapolis: 46,362
18) San Diego: 45,297
19) Detroit: 43,113
20) Honolulu: 42,039
21) Tampa: 41,991
22) Portland: 32,116
23) Charlotte: 29,540
24) St. Louis: 28,035
25) Salt Lake City: 27,434

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