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Aircraft having multiple seating configurations and associated systems and methods are disclosed. An aircraft in accordance with one embodiment, for example, can include a fuselage having a generally circular cross-sectional shape and one or more passenger cabin portions. The individual cabin portio

Aircraft having multiple seating configurations and associated systems and methods are disclosed. An aircraft in accordance with one embodiment, for example, can include a fuselage having a generally circular cross-sectional shape and one or more passenger cabin portions. The individual cabin portions can include a floor connected to the fuselage and a plurality of passenger seats attached to the floor. The passenger seats are in a configuration selected from a first twin aisle seat-row arrangement and a second, single aisle seat-row arrangement. Each of the first and second seat-row arrangements is implementable in the fuselage. Further, the seats in either the first seat-row arrangement or the second seat-row arrangement have between a three abreast and a six abreast seating configuration.

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1. An aircraft system, comprising: a fuselage having a generally circular cross-sectional shape and one or more passenger cabin portions, the individual cabin portions including— a floor connected to the fuselage; anda plurality of passenger seats attached to the floor in a configuration selected fr

1. An aircraft system, comprising: a fuselage having a generally circular cross-sectional shape and one or more passenger cabin portions, the individual cabin portions including— a floor connected to the fuselage; anda plurality of passenger seats attached to the floor in a configuration selected from a first seat-row arrangement and a second seat-row arrangement, each of which is implementable in the fuselage, wherein the first seat-row arrangement includes a twin aisle configuration and the second seat-row arrangement includes a single aisle configuration, and wherein the seats in either the first seat-row arrangement or the second seat-row arrangement have between a three abreast and a six abreast seating configuration, andwherein the individual seat-rows in either the first seat-row arrangement or the second seat-row arrangement include a first outboard portion adjacent to an inner wall at a first side of the fuselage and a second outboard portion adjacent to an inner wall at a second, opposite side of the fuselage, and wherein the lateral distance between the first outboard portion and the second outboard portion is about, but not greater than, 158 inches. 2. The aircraft of claim 1 wherein an outer cross-sectional dimension of the fuselage is from about 171 inches to about 180 inches. 3. The aircraft of claim 1 wherein an outer cross-sectional dimension of the fuselage is about 171 inches. 4. The aircraft of claim 1 wherein: the seats in the first seat-row arrangement have a seat bottom width of at least about 17.2 inches, and each aisle has a width of at least about 18 inches; andthe seats in the second seat-row arrangement have a seat bottom width of about 19 inches and the single aisle has a width of at least about 20 inches. 5. The aircraft claim 1 wherein: in the first seat-row arrangement, the seats are positionable in one of a 2-2-2, 1-2-1, 1-1-1, 2-1-2, 1-3-1, and 1-4-1 seat-row arrangement; andin the second seat-row arrangement, the seats are positionable in one of a 3-3, 2-2, 2-3, and 3-2 seat-row arrangement. 6. The aircraft of claim 1 wherein the individual cabin portions include a first quantity of seats when the seats are in the first seat-row arrangement and a second quantity of seats when the seats are in the second seat-row arrangement, and wherein the first and second quantities are the same. 7. The aircraft of claim 1 wherein the fuselage further comprises one or more cargo holds, and wherein the individual cargo holds are sized to carry an LD3-45 cargo container. 8. The aircraft of claim 1 wherein: the fuselage has an outer cross-sectional dimension of about 171 inches;in the first seat-row arrangement, the seats are positioned in a 2-2-2 seat-row arrangement with two aisles extending approximately parallel with a longitudinal axis of the fuselage, and wherein the seats in the first seat row arrangement have a seat bottom width of about 17.2 inches, and each aisle has a width of about 18 inches;in the second seat row arrangement, the seats are positioned in a 3-3 seat-row arrangement with a single aisle extending approximately parallel with the longitudinal axis of the fuselage, and wherein the seats in the second seat row arrangement have a seat bottom width of about 19 inches and the single aisle has a width of about 20 inches. 9. The aircraft of claim 1 wherein in the first seat-row arrangement, the seats are positionable in a 2-2-2 seat-row arrangement having two aisles extending approximately parallel with a longitudinal axis of the fuselage, and wherein in the second seat row arrangement, the seats are positionable in a 3-3 seat-row arrangement having a single aisle extending approximately parallel with the longitudinal axis of the fuselage. 10. The aircraft of claim 9 wherein the fuselage includes a first cabin portion and a second cabin portion, and wherein the seats in the first cabin portion are arranged in the first seat-row arrangement and the seats in the second cabin portion are arranged in the second seat-row arrangement. 11. An aircraft, comprising: a fuselage having an outer wall, an inner wall, and a generally circular cross-sectional profile, and wherein the inner cross-sectional dimension is less than about 160 inches;a floor coupled to the fuselage, the floor being generally transverse to a longitudinal axis of the fuselage to define, at least in part, one or more passenger cabins and one or more cargo holds in the fuselage; anda plurality of passenger seats removably coupled to the floor in one or more corresponding passenger cabins, the seats being in a six abreast seat-row configuration and reconfigurable between a single aisle arrangement and a twin aisle arrangement, and wherein in either seat-row arrangement, the individual seats have a seat bottom width of at least about 17.2 inches and the individual aisles have a width of at least about 18 inches, andwherein the one or more passenger cabins in the fuselage have a seating envelope with a width of about, but not more than, 158 inches. 12. The aircraft of claim 11 wherein the outer cross-sectional dimension of the fuselage is from about 171 inches to about 180 inches. 13. The aircraft of claim 11 wherein: in the single aisle arrangement, the seats are positioned in a 3-3 seat-row arrangement having a single aisle extending approximately parallel with the longitudinal axis of the fuselage; andin the twin aisle arrangement, the seats are positioned in a 2-2-2 seat-row arrangement having two aisles extending approximately parallel with the longitudinal axis of the fuselage. 14. The aircraft of claim 13 wherein in the twin aisle arrangement, the seats are further positionable in a 1-4-1 seat row arrangement having two aisles extending approximately parallel with the longitudinal axis of the fuselage. 15. The aircraft of claim 13 wherein: the individual seats in the 3-3 seat row arrangement have a seat bottom width of about 19 inches and the aisle has a width of about 20 inches; andthe individual seats in the 2-2-2 seat row arrangement have a seat bottom width of about 17.2 inches and each aisle has a width of about 18 inches. 16. A method of configuring an interior of an aircraft, the method comprising: installing a plurality of first passenger seats to a floor in a first fuselage portion having a generally circular cross-sectional profile and a lateral seating envelope dimension of about, but not greater than, 158 inches, wherein the seats are installed in the first fuselage portion in a first, single aisle seat-row arrangement; andinstalling a plurality of second passenger seats to a floor in a second fuselage portion having a generally identical cross-sectional profile and lateral seating envelope dimension as the first fuselage portion, and wherein the seats are installed in the second fuselage portion in a second, twin aisle seat-row arrangement. 17. The method of claim 16 wherein installing a plurality of first passenger seats to a floor in a first fuselage portion having a generally circular cross-sectional profile comprises installing the first seats in a first fuselage portion having an outer cross-sectional dimension of from about 171 inches to about 180 inches. 18. The method of claim 16 wherein installing a plurality of passenger seats to a floor in a first fuselage portion having a generally circular cross-sectional profile comprises installing the seats in a first fuselage portion having an outer cross-sectional dimension of about 171 inches. 19. The method of claim 16 wherein installing a plurality of first passenger seats in a first fuselage portion and installing a plurality of second passenger seats in a second fuselage portion comprises installing the first and second seats in first and second fuselage portions, respectively, of the same aircraft. 20. The method of claim 16 wherein: installing a plurality of first passenger seats to a floor in a first fuselage portion comprises installing first seats having a seat bottom width of about 19 inches in a 3-3 seat-row arrangement having a single aisle with a width of about 20 inches extending approximately parallel with a longitudinal axis of the fuselage; andinstalling a plurality of second passenger seats to a floor in a second fuselage portion comprises installing second seats having a seat bottom width of about 17.2 inches in a 2-2-2 seat-row arrangement having two aisles extending approximately parallel with the longitudinal axis of the fuselage, the individual aisles having a width of about 18 inches. 21. The method of claim 16 wherein: installing a plurality of first passenger seats to a floor in a first fuselage portion comprises installing the first seats in at least one of a 3-3, 2-2, 2-3, and 3-2 seat-row arrangement; andinstalling a plurality of second passenger seats to a floor in a second fuselage portion comprises installing the second seats in at least one of a 2-2-2, 1-2-1, 1-1-1, 2-1-2, 1-3-1, and 1-4-1 seat row arrangement.