The ornamental design for a set of aircraftlandingskids, as shown and described.
FIG. 1 is a front plan view of the set of aircraft landing skids;
FIG. 2 is a rear plan view of the set of aircraft landing skids;
FIG. 3 is a right side plan view of the set of aircraft landing skids;
FIG. 4 is a left side plan view of the set of aircraft landing skids; and,
FIG. 5 is a bottom plan view of the set of aircraft landing skids.
The broken line showing of the aircraft is for the purpose of illustrating the environmental structure in which the claimed elements are found and forms no part of the claimed design.