CIA officials, most notably Duane Clarridge, worked around the clock in securing a better way of delivery. In late November 1985, a CIA 707 was secured from Frankfurt to deliver eighteen HAWK missiles to the Iranians on Monday, November 25. The plan required proof of presidential backing, which, due to the timing of the events, required a retroactive signature authorizing, "the provision of assistance by the Central Intelligence Agency to private parties in their attempt to obtain the release of Americans held hostage in the Middle East."[69] The document was signed by Reagan on December 5, 1985.