The ornamental design for a set of aircraft sliding side doors, as shown and described.
FIG. 1 is a left plan view of the set of aircraft sliding side doors with the doors in an open position;
FIG. 2 is a left plan view of the set of aircraft sliding side doors with the doors in a closed position;
FIG. 3 is a right plan view of the set of aircraft sliding side doors with the doors in an open position; and,
FIG. 4 is a left plan view of the set of aircraft sliding side doors with the doors in a closed position.
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.
In addition, thick lines are used to outline objects, while thin lines show contours.