Abstract: Embodiments of an access door of an unmanned aerial vehicle (UAV) landing pad, and methods of its use, are described. An apparatus includes a stationary rail including first and second channels, and a door panel coupled to the stationary rail. At least a portion of the first channel is located above at least a portion of the second channel. The door panel is slidingly movable with respect to the first and second channels from a first position to a second position. The door panel, in the first position, has an upper surface that is substantially co-planar with an upper surface of a UAV landing pad. The door panel in the second position is lower than the upper surface of the UAV landing pad and laterally offset with respect to the first position such that an opening in the UAV landing pad configured to permit a package to be passed therethrough is exposed.