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A passenger seat movable from an upright to a recline position without encroaching on an aft-seated passenger, and including a seat base for being attached to a supporting surface. A unitary seating element is provided and includes a pair of laterally-spaced apart seat frames carried by the seat bas

A passenger seat movable from an upright to a recline position without encroaching on an aft-seated passenger, and including a seat base for being attached to a supporting surface. A unitary seating element is provided and includes a pair of laterally-spaced apart seat frames carried by the seat base, the seat frames defining a curved shape corresponding to the profile of an anatomically-appropriate seat bottom and seat back. A curved, semi-rigid diaphragm support is carried between the seat frames in alignment with the curved shape of the seat frames and mounted for movement relative to the seat frames between a first, upright position and a second, reclined position. A diaphragm is positioned under tension on the diaphragm support for providing a continuous seat bottom and seat back support surface for a seat occupant. Stretchers are attached to and extend between opposite sides of the diaphragm support for maintaining the diaphragm support in a spaced-apart condition with the diaphragm in tension.

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1. A beam for a passenger seat, comprising: a hollow body having a first end defining a first cross-section for being mounted to a first seat frame, a second end defining a second cross-section for being mounted to a second spaced-apart seat frame, and a central portion disposed between said first a

1. A beam for a passenger seat, comprising: a hollow body having a first end defining a first cross-section for being mounted to a first seat frame, a second end defining a second cross-section for being mounted to a second spaced-apart seat frame, and a central portion disposed between said first and second ends and defining a central cross-section for being mounted to a seat base disposed centrally below said first and second seat frames, said body being curved such that said central portion is laterally downwardly offset from said first and second ends, wherein said first and second cross-sections comprise a plurality of sides and said central cross-section is generally oval. 2. The beam according to claim 1, wherein said body comprises aluminum. 3. The beam according to claim 1, wherein said body comprises an amorphous alloy. 4. The beam according to claim 1, wherein said body comprises carbon fibers. 5. The beam according to claim 1, wherein a metallic cellular truss core material is disposed in said body. 6. A passenger seat frame assembly comprising: first and second spaced-apart seat frames, each of said seat frames defining a curved shape corresponding to a profile of an anatomically-appropriate seat bottom and defining first and second beam mounting points respectively; a seat base for being attached to a supporting surface, said seat base having a central beam mounting point disposed centrally between and lower than said first and second beam mounting points; and a beam comprising a hollow body having a first end defining a first cross-section, a second end defining a second cross-section, and a central portion disposed between said first and second ends and defining a central cross-section, wherein said body is curved such that said central portion is laterally downwardly offset from said first and second ends, and wherein said first end is attached to said first beam mounting point, said second end is attached to said second beam mounting point, and said central portion is attached to said central beam mounting point. 7. The beam according to claim 6, wherein said body comprises an amorphous alloy. 8. The passenger seat frame assembly of claim 6, wherein said first beam mounting point comprises an opening having a shape complementary to said first cross-section of said beam, and said second beam mounting point comprises an opening having a shape complementary to said second cross-section of said beam. 9. The passenger seat frame assembly according to claim 6, wherein said first, second, and central cross-sections of said beam are generally oval. 10. The passenger seat frame assembly according to claim 6, wherein said first and second cross-sections of said beam comprise a plurality of sides and said central cross-section is generally oval. 11. The passenger seat frame assembly according to claim 6, wherein said body of said beam comprises carbon fibers. 12. The passenger seat frame assembly according to claim 6, wherein a metallic cellular truss core material is disposed in said body of said beam. 13. The passenger seat frame assembly according to claim 6, wherein said body of said beam comprises aluminum. 14. A passenger seat comprising: first and second spaced-apart seat frames, each of said seat frames defining a curved shape corresponding to a profile of an anatomically-appropriate seat bottom and defining first and second beam mounting points respectively; a seat base for being attached to a supporting surface, said seat base having a central beam mounting point disposed centrally between and lower than said first and second beam mounting points; a beam comprising a hollow body having a first end having a first cross-section, a second end having a second cross-section, and a central portion disposed between said first and second ends and having a central cross-section, wherein said body is curved such that said central portion is laterally downwardly offset from said first and second ends, and wherein said first end is attached to said first beam mounting point, said second end is attached to said second mounting point, and said central portion is attached to said central beam mounting point; and a diaphragm positioned under tension between said first and second seat frames for providing a continuous seat bottom and seat back support surface for a seat occupant. 15. The beam according to claim 14, wherein said body comprises an amorphous alloy. 16. The passenger seat frame assembly of claim 14, wherein said first beam mounting point comprises an opening having a shape complementary to said first cross-section of said beam, and said second beam mounting point comprises an opening having a shape complementary to said second cross-section of said beam. 17. The passenger seat frame assembly according to claim 14, wherein said first cross-section, said second cross-section, and said central cross-section of said beam are all generally oval. 18. The passenger seat frame assembly according to claim 14, wherein said first and second cross-sections of said beam comprise a plurality of sides and said central cross-section is generally oval. 19. The passenger seat frame assembly according to claim 14, wherein said body of said beam comprises carbon fibers. 20. The passenger seat frame assembly according to claim 14, wherein a metallic cellular truss core material is disposed in said body of said beam. 21. The passenger seat frame assembly according to claim 14, wherein said body of said beam comprises aluminum.