An aircraft seat assembly including a set of three seats (110A, 110B, 110C) supported by a common seat frame, comprising: an inner seat fixedly attached to a seat frame, said inner seat having an inner seating surface and an inner seat back; a middle seat fixedly attached to said seat frame and having an inner edge disposed adjacent to an outer edge of said inner seat, said middle seat having a middle seat surface and a middle seat back; an outer seat having an outer seat surface and an outer seat back an inner armrest and an outer armrest disposed on opposing sides of the outer seat surface, wherein said inner and outer seat surfaces (112C, 112A) are disposed in a common first reference plane (D-D') disposed vertically above a second reference plane (C-C') defined by said middle seat surface and wherein said inner and outer seat backs (114C, 114A) are disposed in a common forth reference plane (B-B') disposed in front of a third reference plane (A-A') defined by said middle seat back; a slide mechanism movably supported by said seat frame and configured to move laterally between a first position and a second position relative to said seat frame, wherein said outer seat is attached to said slide mechanism and is configured to move between said first and second positions, wherein: in said first position said outer seat is disposed adjacent to said middle seat and said inner arm rest is disposed between said outer seat surface and said middle seat surface; and in said second position a bottom surface of said outer seating surface is disposed over at least a portion of said middle seating surface and said outer seat back is disposed in front of at least a portion of said middle seat back and said inner arm rest is disposed above said middle seat surface and an aisle width adjacent to an outer edge of said outer seat is increased. an inner seat fixedly attached to a seat frame, said inner seat having an inner seating surface and an inner seat back; a middle seat fixedly attached to said seat frame and having an inner edge disposed adjacent to an outer edge of said inner seat, said middle seat having a middle seat surface and a middle seat back; an outer seat having an outer seat surface and an outer seat back an inner armrest and an outer armrest disposed on opposing sides of the outer seat surface, wherein said inner and outer seat surfaces (112C, 112A) are disposed in a common first reference plane (D-D') disposed vertically above a second reference plane (C-C') defined by said middle seat surface and wherein said inner and outer seat backs (114C, 114A) are disposed in a common forth reference plane (B-B') disposed in front of a third reference plane (A-A') defined by said middle seat back; a slide mechanism movably supported by said seat frame and configured to move laterally between a first position and a second position relative to said seat frame, wherein said outer seat is attached to said slide mechanism and is configured to move between said first and second positions, wherein: in said first position said outer seat is disposed adjacent to said middle seat and said inner arm rest is disposed between said outer seat surface and said middle seat surface; and in said second position a bottom surface of said outer seating surface is disposed over at least a portion of said middle seating surface and said outer seat back is disposed in front of at least a portion of said middle seat back and said inner arm rest is disposed above said middle seat surface and an aisle width adjacent to an outer edge of said outer seat is increased. in said first position said outer seat is disposed adjacent to said middle seat and said inner arm rest is disposed between said outer seat surface and said middle seat surface; and in said second position a bottom surface of said outer seating surface is disposed over at least a portion of said middle seating surface and said outer seat back is disposed in front of at least a portion of said middle seat back and said inner arm rest is disposed above said middle seat surface and an aisle width adjacent to an outer edge of said outer seat is increased.