Multiple realities
(covers information from several alternate timelines)

A moon shuttle was an unsophisticated type of shuttlecraft which were used during the 22nd and 23rd centuries.

In 2155 of the mirror universe, Captain Jonathan Archer imagined that he saw a counterpart of himself from a parallel universe. The illusion told him that he would more probably "end up commanding a moon shuttle" than receive official authorization from Starfleet to command an advanced starship named the Defiant. (ENT: "In a Mirror, Darkly, Part II")

Aboard the USS Enterprise of the primary universe, 111 years later, Doctor Leonard McCoy was berated by Captain James T. Kirk for not alerting the captain on the ship's red alert status during a physical. The doctor then quipped, "What am I, a doctor or a moon shuttle conductor?", implying that it wasn't his job to do so. (TOS: "The Corbomite Maneuver")

In the second revised draft script of "The Corbomite Maneuver" (dated 20 May 1966), McCoy's reference was instead to "a trolley car conductor".
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