; (B) assurances that the applicant will provide the non-Federal share and that the non-Federal share is not derived from airport revenue; (C) a proposed route structure serving not more than 8 communities; and (D) a timeline for commencing the air service to the communities within the proposed route structure. (4) Criteria for participation The Secretary may approve up to 3 applications each fiscal year, subject to the availability of funds, if the Secretary determines that— (A) the proposal of the applicant can reasonably be expected to encourage and improve levels of air service between the relevant communities; (B) the applicant has adequate financial resources to ensure the commitment to the communities; (C) the airports serving the communities are nonhub, small hub, or medium hub airports, as determined using the Department of Transportation’s most recently published classifications; and (D) the air carrier commits to serving the communities for at least 2 years. (5) Priorities The Secretary shall prioritize applications that— (A) would initiate new or reestablish air service in communities where air fares are higher than the average air fares for all communities; (B) are more likely to result in self-sustaining air service at the end of the program; (C) request a Federal share lower than 50 percent