US has a huge presence at LGA and DCA, neither of which they are permitted to fly transcon from. They could from BOS, also a big focus city, but never have. Someone correct me if I'm wrong- I know US did fly transatlantic service from BOS at one point but I don't think transcon.
If you look at US's route map, JFK is the one oddball on the east coast not served by them. I think the last time they flew there at all was around 1999/2000. They did at one point have Dash 8 "Champagne" flights, can't remember from where, that connected to British Airways Concorde flight when they were in cahoots with them.
The only non-PHL/CLT/PIT transcons US ever did was BWI-LAX and SFO which ended around 01 or 02. I believe they flew to LA from places like IND, CMH, DAY, and MCI but those wouldn't be considered transcon.
It is strange that the largest east coast airline, and one of the largest in New York, Washington, and Boston has never flown transcon from those cities, but it's a combination of permiter-restrictions at the otherwise more desirable airports, and well-established competition from UA, AA, DL, etc. They have applied unsuccessfully several times for DCA-LAX and DCA-LAS, so they would if they could out of "thier" airports.
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