Federal statute requires that sponsors of airport development projects hold "good title, satisfactory to the Secretary" (of Transportation) to the airport being developed. To meet these requirements, a sponsors' title must be free and clear of any reversionary interest, lien, easement, lease, or other encumbrance that would create undue risk that might deprive the sponsor of control or possession, interfere with its use for public airport purposes, or make it impossible for the sponsor to carry out the obligations and covenants in the grant agreement. Under FAA procedures, satisfactory evidence of good title includes an attorney's title opinion that is properly tied to an Exhibit "A" Airport Property Map.