The P-8A is a derivative of the highly successful and reliable Next-Generation 737. The P-8A has the fuselage of a 737-800 and the wings of a 737-900. Modifications to the baseline commercial aircraft are incorporated into the aircraft in-line. In the past, commercial aircraft were sent to modification centers where they were taken apart and rebuilt to meet military specifications. The P-8A is Boeing's first military derivative aircraft to incorporate structural modifications to the aircraft as it moves through the commercial line.