Final answer:
A child restraint system on Allegiant Air flights must not occupy exit row seats due to safety regulations.
Step-by-step explanation:
Any child safety seat that bears the correct labeling will be accepted for use on Allegiant Air flights, with the stipulation that a child restraint system should never occupy exit row seats. This is due to safety regulations that require exit rows to remain unobstructed in the event of an emergency that necessitates a quick evacuation of the plane. Seats such as front row seats, bulkhead seats, and window seats do not have the same restrictions and may be used for a child restraint system provided that they meet Allegiant's size and installation requirements.