The ornamental design for an airtireinflatinggun, as shown and described.
FIG. 1 is a front elevation view of an air tire inflating gun showing my new design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a perspective view thereof.
The features shown in broken lines in the various figures are shown for illustrating environmental structure and forming no part of the claimed design.