Will a 787 replace the P-8 Poseidon?

Will the next US anti-submarine patrol aircraft be based on the Boeing 787?

Probably not soon: the 737-based P-8 is new, widely adopted, and likely to serve for decades like the P-3 before it.

The P-3 Orion's exceptionally long production and service history provides the comparison for the new Poseidon's likely longevity. With a large international fleet already operating, the P-8 should remain an enduring platform. Its eventual successor will more likely follow the airliner that replaces the 737 family.