(1) Washington airport aid program projects undertaken by a sponsor. The terms, conditions, and assurances of this grant agreement shall remain in full force and effect throughout the useful life of the facilities developed or equipment acquired for an airport project, not to exceed twenty years from the date of acceptance of a grant offer of state funds for the project. However, there shall be no limit on the duration of the assurances regarding exclusive rights and airport revenue so long as the airport is used as an airport. There shall be no limit on the duration of the terms, conditions, and assurances with respect to real property acquired with state funds.

(2) Airport planning undertaken by a sponsor. Unless otherwise specified in this grant agreement, only Assurances C:1, 2, 3, 4, 6, 7, 8, 13, 20, 33, 34, and 35 apply to planning projects. The terms, conditions, and assurances of this grant agreement shall remain in full force and effect during the life of the project.