Appendix I provides a list of significant events affecting the Navy's A-12 program, including the Secretary of Defense's Major Aircraft Review in December 1989. After the Secretary's April 1990 testimony on the results of the review, the A-12 contractors disclosed that the date of the A-12's first flight would slip significantly and that the cost of full-scale development would overrun the contract ceiling by an amount that the contractors could not absorb. The chronology extends through June 1991, when the A-12 contractors filed a lawsuit in U.S. Claims Court, asking, among other things, for a judgment that the A-12 contract was terminated for the convenience of the government. According to the Navy, if the court rules that the termination was for the convenience of the government, rather that a default for nonperformance, the contractors may not be required to return the $1.35 billion in progress payments. The lawsuit is still pending. Appendix II lists the payments made to McDonnell Douglas for work on the A-12 full-scale development contract. These payments totaled $1.4 billion and were made monthly from contract award to contract termination. General Dynamics was paid about $1.3 billion for its work on the A-12 full-scale development contract. Appendix II also shows the $25.6 million in additional payments made to McDonnell Douglas for A-12 related work under a separate basic ordering agreement. These payments were made from contract award to February 1992.