The invention relates to a seat securing system for securing air passenger seats to a securing rail (10), whereby the system permits a relative motion between a mounting part (24) and a base body (26) that, in the longitudinal direction of said securing rail (10), can be brought into a fixed position. In this securing position, a locking body (34), which can pivot from a release position and into a locking position and which is subjected to the action of an energy storage device (32), secures the respective detent parts (22, 30) and thus the base body (24) and mounting part (26) on the securing rail (10). Said energy storage device permits a compensation of tolerances so that the inventive fitting always rests securely against the rail(10).