49 U.S. Code § 41744. Preservation of basic essential air service at single carrier dominated hub airports
(a) In General.—
If the Secretary of Transportation determines that extraordinary circumstances jeopardize the reliable performance of essential air service under this subchapter from a subsidized essential air service community to and from an essential airport facility, the Secretary may require an air carrier that has more than 60 percent of the total annual enplanements at the essential airport facility to take action to enable another air carrier to provide reliable essential air service to that community. Actions required by the Secretary under this subsection may include interline agreements, ground services, subleasing of gates, and the provision of any other service or facility necessary for the performance of satisfactory essential air service to that community.
(b) Essential Airport Facility Defined.—
Effective Date of 2003 Amendment
Amendment by Pub. L. 108–176 applicable only to fiscal years beginning after Sept. 30, 2003, except as otherwise specifically provided, see section 3 of Pub. L. 108–176, set out as a note under section 106 of this title.