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An aircraft passenger cabin in an aircraft fuselage wherein an upper portion of the cabin volume is a substantially elliptical cross section and a lower portion of the cabin volume is a cross section extending laterally into a blended area of the wing and fuselage typically referred to as a wing to

An aircraft passenger cabin in an aircraft fuselage wherein an upper portion of the cabin volume is a substantially elliptical cross section and a lower portion of the cabin volume is a cross section extending laterally into a blended area of the wing and fuselage typically referred to as a wing to body fairing.

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1. A passenger airplane comprising: a fuselage accommodating an interior pressurized passenger cabin containing a plurality of rows of passenger seats;said fuselage having an upper cross section shape and a lower cross section shape defining a fuselage structural shell,said upper cross section shape

1. A passenger airplane comprising: a fuselage accommodating an interior pressurized passenger cabin containing a plurality of rows of passenger seats;said fuselage having an upper cross section shape and a lower cross section shape defining a fuselage structural shell,said upper cross section shape having a non-circular, elliptical cross section;said lower cross section shape comprising an enlargement of a lower portion of the pressurized passenger cabin to provide passenger seating up to the major diameter of the elliptical cross section;wings coupled to said lower cross section shape at a wing-to-body interface having a wing to body fairing;said wing to body fairing containing a pressurized volume that is integrated into the lower cross section shape as part of the interior pressurized passenger cabin. 2. The passenger airplane of claim 1 wherein the non-circular elliptical cross section has a horizontal major axis greater than two (2) times a vertical minor axis. 3. The passenger airplane of claim 1 further comprising main landing gear and nose landing gear, and at least two engines, wherein the main landing gear is beneficially located outside of and adjacent to the pressurized volume for beneficial main cabin use and within the minimum wetted area and profile of the aircraft. 4. The passenger airplane of claim 1, wherein a floor of the passenger cabin is between 66 to 70 inches above ground level when the main and nose landing gears are deployed. 5. The passenger airplane of claim 1 wherein the enlargement of the lower portion of the pressurized passenger cabin extends beyond a major diameter of the elliptical cross section. 6. The passenger airplane of claim 1 wherein the fuselage has a substantially elliptical planform. 7. The passenger airplane of claim 6 wherein a major axis of the substantially elliptical planform is greater than two times a minor axis of the substantially elliptical planform. 8. The passenger airplane of claim 6 wherein a minor axis of the elliptical planform terminates adjacent the wing to body fairing. 9. A passenger airplane comprising: a fuselage accommodating an interior pressurized passenger cabin containing a plurality of rows of passenger seats;said fuselage having an upper cross section shape and a lower cross section shape defining a fuselage structural shell,said upper cross section shape having a non-circular, elliptical cross section wherein the fuselage incorporates a single crown longeron;wings coupled to said lower cross section shape at a wing-to-body interface having a wing to body fairing;said wing to body fairing containing a pressurized volume that is integrated into the lower cross section shape as part of the interior pressurized passenger cabin. 10. A passenger airplane comprising: a fuselage accommodating an interior pressurized passenger cabin containing a plurality of rows of passenger seats;said fuselage having an upper cross section shape and a lower cross section shape defining a fuselage structural shell wherein the fuselage incorporates a single keel longeron,said upper cross section shape having a non-circular, elliptical cross section;wings coupled to said lower cross section shape at a wing-to-body interface having a wing to body fairing;said wing to body fairing containing a pressurized volume that is integrated into the lower cross section shape as part of the interior pressurized passenger cabin. 11. The passenger airplane of claim 1 wherein a baggage compartment is aft of an occupied portion of the passenger cabin. 12. The passenger airplane of claim 1 wherein engines are mounted to the fuselage adjacent the baggage compartment. 13. An aircraft passenger cabin in a fuselage comprising: an upper volume having a substantially elliptical cross section, and;a lower volume integrated with the upper volume as a single main volume in an interior pressurized cabin, said lower volume having a cross section extending laterally into a wing to body fairing. 14. The aircraft passenger cabin as defined in claim 13 wherein a cross section of the lower volume is substantially rectangular. 15. The aircraft passenger cabin as defined in claim 13 wherein the cross section of the lower volume extends laterally at least the width of a major axis of the substantially elliptical upper cross section. 16. The aircraft passenger cabin as defined in claim 13 wherein the cross section of the lower volume extends laterally beyond the width of a major axis of the substantially elliptical upper cross section. 17. The aircraft passenger cabin as defined in claim 13 having a substantially flat floor extending laterally at least the width of a major axis of the substantially elliptical cross section of the upper volume. 18. The aircraft passenger cabin as defined in claim 13 wherein a major axis of the elliptical cross section is at least two times a minor axis.