(a) A WEEL will be effective on the date on which we approve the WEEL, even if an appeal is filed under part 2 of this chapter.

(b) The WEEL may specify a date on which the obligations between the parties to a WEEL are triggered. Such date may be before or after the approval date under paragraph (a) of this section.

(c) WEEL lease documents not requiring our approval are effective upon execution by the parties, or on the effective date specified in the lease document. If the WEEL lease document does not specify an effective date, it becomes effective upon execution by the parties.