An adjustable passenger seating arrangement comprising: - a first floor-mounted seat rail adapted to extend through at least a portion of a passenger carrying compartment; - a seat support adapted for supporting a passenger seat and for sliding within or on said seat rail; and - a first locking assembly arranged in connection to said seat support and adapted for releasably fastening of said seat support to said first seat rail; wherein said first locking assembly comprises a first mechanism adapted for engaging with said first seat rail, said first mechanism comprising a lever arm (210, 310) configured as a foot pedal and pivotably connected to said seat support; wherein said first seat rail comprises walls with inwardly directed lips, said walls defining a) a central longitudinal guide channel running along the length of said seat rail, and b) a longitudinal guide slot defined by said lips and running along the length of said seat rail, wherein said guide slot communicates with said guide channel and has a width, which is narrower than said guide channel, wherein said lips are configured with a first contact surface facing said guide channel, and a second contact surface opposite said first contact surface and facing away from said guide channel, wherein said seat support further comprises a base part with a pair of guide pins each with a head portion and a neck portion, said head portion adapted for sliding within said guide channel and said neck portion adapted for sliding within said guide slot; characterised in that said first mechanism further comprises a push plate positioned in between said pair of guide pins and being operably connected to said lever arm (210, 310), said push plate being adapted for abutting or engaging with said second contact surface when said lever arm (210, 310) is operated into a first position, thereby lifting said pair of guide pins relative to said guide channel, and wherein the head portion of each pair of guide pins is adapted for abutting or engaging with said first contact surface when said lever arm (210, 310) is operated into said first position. - a first floor-mounted seat rail adapted to extend through at least a portion of a passenger carrying compartment; - a seat support adapted for supporting a passenger seat and for sliding within or on said seat rail; and - a first locking assembly arranged in connection to said seat support and adapted for releasably fastening of said seat support to said first seat rail; wherein said first locking assembly comprises a first mechanism adapted for engaging with said first seat rail, said first mechanism comprising a lever arm (210, 310) configured as a foot pedal and pivotably connected to said seat support; wherein said first seat rail comprises walls with inwardly directed lips, said walls defining a) a central longitudinal guide channel running along the length of said seat rail, and b) a longitudinal guide slot defined by said lips and running along the length of said seat rail, wherein said guide slot communicates with said guide channel and has a width, which is narrower than said guide channel, wherein said lips are configured with a first contact surface facing said guide channel, and a second contact surface opposite said first contact surface and facing away from said guide channel, wherein said seat support further comprises a base part with a pair of guide pins each with a head portion and a neck portion, said head portion adapted for sliding within said guide channel and said neck portion adapted for sliding within said guide slot; characterised in that said first mechanism further comprises a push plate positioned in between said pair of guide pins and being operably connected to said lever arm (210, 310), said push plate being adapted for abutting or engaging with said second contact surface when said lever arm (210, 310) is operated into a first position, thereby lifting said pair of guide pins relative to said guide channel, and wherein the head portion of each pair of guide pins is adapted for abutting or engaging with said first contact surface when said lever arm (210, 310) is operated into said first position.