The current RTW guidelines consider these city pairs to be transcon:

BWI/BOS/FLL/BDL/MIA/EWR/NYC/ORL/PHL/SJU/YYZ/WAS and one of
LAS/LGB/LAX/OAK/SNA/PDX/SAN/SFO/SEA/SJC/YVR.

Are there any flights that are long distance but not picked up here? 2 years ago, there was a flight from LAX-SXM with 1 flight number - very nice for getting us into the Caribbean.

I am struggling with the US portion of an RTW I want to book. I've got 4 sectors available for the US. I'd like to go somewhere that I can't get to inexpensively in the normal course of events. I'd love to go to a new Caribbean island such as Aruba. I can do one direction with just two segments - SAN-JFK-AUA - but due to the transcon rules, can't do the return in 2 segments.

Are there any Caribbean islands with flights to DFW or ORD (other than San Juan - been there, done that, little interest in going again). Are there any quirks such as LAX-SXM?

I'd like to fly in and out of SAN, but can use LAX as a jumping off point to save sectors.

Once upon a time there was a thread that addressed this. hauteboy might have been a key contributor - but I haven't found it.

And is there a resource where I can look at all the nonstop and direct flights from a particular city on a particular airline? Obviously, I want to do this for ORD and DFW for AA.