; and (ii) is not located within a Metropolitan Statistical Area (as defined by the Office of Management and Budget); (B) at a nonhub, small hub, or medium hub airport; or (C) at an airport receiving an exemption under section 47134. (4) Federal share (A) In general Except as provided in subparagraph (B), the Government’s share of allowable project costs under this subsection is 80 percent. (B) Submission In applying for a grant under this subsection, an airport sponsor that proposes a lower Government share of allowable project costs than the share specified in subparagraph (A) shall receive priority commensurate with the reduction in such share. Projects shall receive equal priority consideration if such project— (i) has a proposed Government cost share of 50 percent or less