The ornamental design for a stackablerunwaybarrier for airports, as shown and described.
FIG. 1 is a perspective view of a stackable runway barrier for airports showing my new design;
FIG. 2 is a perspective upside down view of a stackable runway barrier for airports showing my new design;
FIG. 3 is a front view of a stackable runway barrier for airports showing my new design;
FIG. 4 is a back view of a stackable runway barrier for airports showing my new design;
FIG. 5 is a side view s of a stackable runway barrier for airports showing both sides of my new design;
FIG. 6 is a top view of a stackable runway barrier for airports showing my new design; and,
FIG. 7 is a bottom view of a stackable runway barrier for airports showing my new design.
The broken line showing of flags and a light is included for the purpose of illustrating portions of the “article” and forms no part of the claimed design.