DL has both First Class and Delta One available on transcon routes. For WAS to SAN you would need to take DCA-LAX-SAN or WAS-JFK-SAN in order to get Delta One. However, this will cost more than the First Class routings ($1470 is the cheapest roundtrip Delta One fare and requires a 3-week advance purchase). Also, not all flights on JFK-SAN are Delta One flights (only one out of the 3-4 daily flights is Delta One).