Question: Which jet fighter is currently in service in the United States and is to replace the United States navy's F/A-18E/F Super Hornet?
Sentence (from "F/A-XX Program"): F/A-XX is a development and acquisition program for a future sixth-generation air superiority fighter to replace the United States Navy's F/A-18E/F Super Hornet beginning in late-2020s.
Relevant evidence: Yes