Except as provided in subsection (b), a covered air carrier shall not deny a passenger the ability to check a stroller at the departure gate if the stroller is being used by a passenger to transport a child traveling on the same flight as the passenger.

Subsection (a) shall not apply in instances where the size or weight of the stroller poses a safety or security risk.

In this section, the term “covered air carrier” means an air carrier or a foreign air carrier as those terms are defined in section 40102 of title 49, United States Code.