Southwest could fly that route itself, but not easily. Southwest has an all-737 fleet but it doesn't

At this moment, I'm thinking about Hawaii because WestJet flies to Hawaii and Southwest does not. So when Southwest announced its plan to sell tickets on WestJet through a code-sharing agreement starting broken music tour sting next year, I had to wonder, what about Hawaii?
Maybe not much. Most Americans don't want to fly to Vancouver to catch a flight to Hawaii. And the U.S. government won't allow a foreign carrier to fly between two U.S. destinations. (See Virgin America , trials of.)
Southwest could fly that route itself, but not easily. Southwest has an all-737 fleet but it doesn't have the 737-800 models with the range for a Hawaii flight. (WestJet does.) As the Southwest blog explained , the company's planes are not equipped and its crews are not trained for flights over large bodies of water. Also worth noting -- Southwest doesn't do red-eye flights, which keep Hawaiian routes moving.
The US government won't even allow Southwest passengers to connect broken music tour sting over Vancouver. Since the itinerary is between two points in the US, it has to be flown solely broken music tour sting by a US airline. If there's a true stopover in Vancouver both ways, maybe that could work, but even then I'm not so sure if it could still be on the same ticket.
I tend to think Southwest won't bother with Hawai'i. It's such a hassle to have the separate subfleet of aircraft that are capable of flying overwater broken music tour sting like that. And Hawai'i isn't exactly a big money maker. Now that ATA is gone, I can't think of a good way for Southwest to be able to make that work.
Southwest Current Fleet of 737-700 can fly to Hawaii easily. Aloha Airlines did. They even used Southwest broken music tour sting 737-700 in the very beginning to get FAA certification. A 737-700 can fly between LA and Maui no problem or Oahu.
Granted that the extended range version of the 737-700 can make that trip, and that's what Aloha was flying. But Southwest doesn't broken music tour sting fly those. They fly the standard 737-700, which doesn't make the distance between LAX and HNL (4100 km).