Advance Payments and Deferred Revenue/Credits	3 Months Ended
Mar. 28, 2024
Advance Payments And Deferred Revenue Credits [Abstract]
Advance Payments	Advance Payments Advances on the B787 Program. Boeing has made advance payments to Spirit under the B787 Special Business Provisions and General Terms Agreement (collectively, the “B787 Supply Agreement”) that are required to be repaid to Boeing by way of offset against the purchase price for future shipset deliveries. Advance repayments were initially scheduled to be spread evenly over the remainder of the first 1,000 B787 shipsets delivered to Boeing. On April 8, 2014, Spirit signed a memorandum of agreement with Boeing that suspended advance repayments related to the B787 program for a period of twelve months beginning April 1, 2014. Repayment recommenced on April 1, 2015, and any repayments that otherwise would have become due during such twelve-month period will offset the purchase price for shipsets 1001 through 1120. On December 21, 2018, Spirit signed a memorandum of agreement with Boeing that again suspended the advance repayments beginning with line unit 818. The advance repayments resumed in 2022 at a lower rate of $0.45 per shipset at line unit number 1135 and will continue through line number 1605. In the event Boeing does not take delivery of a sufficient number of shipsets to repay the full amount of advances prior to the termination of the B787 program or the B787 Supply Agreement, any advances not then repaid will be applied against any outstanding payments then due by Boeing to us, and any remaining balance will be repaid in annual installments of $27.0 due on December 15th of each year until the advance payments have been fully recovered by Boeing. As of March 28, 2024, the amount of advance payments received from Boeing under the B787 Supply Agreement and not yet repaid was approximately $183.2. In support of tooling and capital expenditures for future production rate increases on the B787 program, the memorandum of agreement entered into on October 12, 2023 between Boeing and Spirit (the “2023 MOA”) included an agreement for Boeing to advance Spirit a total of $71.7 in quarterly installments beginning October 2023 through April 2025. Spirit will align the repayment plan to coincide with deliveries to Boeing beginning April 2025 through October 2027. In the event Boeing does not take delivery of a sufficient number of shipsets to repay the full amount of advance prior to October 31, 2027, the remaining balance up to the $71.7 will be due in the fourth quarter of 2027. As of March 28, 2024, the amount of advance payments received by Spirit from Boeing and not yet repaid was approximately $32.2. Advances on the A350 Program. During the twelve months ended December 31, 2023, the Company received an advance payment from Airbus of $100.0 under an agreement between Airbus S.A.S. and Spirit AeroSystems (Europe) Limited (“Spirit Europe”) signed on June 23, 2023 (the “A350 Agreement”). The A350 Agreement provides for up to $100.0 of advances that are required to be repaid along with a nominal fee to Airbus by way of offset against the purchase price of A350 FLE shipset deliveries in 2025. To the extent actual deliveries in 2025 are insufficient to offset the advance amount, any amount not offset against deliveries will be due and payable to Airbus on December 31, 2025. In connection with the A350 Agreement, Spirit Europe has pledged certain program assets including work in process inventories and raw materials at Spirit’s Scotland facility in an amount sufficient to cover the advances. Advances on the A220 Program. During the three months ended March 28, 2024, the Company received an advance payment from Airbus of $17.0 under a term sheet agreement between Airbus Canada Limited Partnership (“Airbus Canada”) and Shorts Brothers PLC (the Company’s facilities located in Belfast, Northern Ireland), for short term funding for increased freight costs incurred in the period from January to March 2024. This advance will form part of a financial support package under a proposed Memorandum of Agreement under negotiations between the parties and shall be used by the Company to enable timely delivery of aerostructures via air freight through March 31, 2024. The increased freight costs will be fully borne by the Company. The parties’ original intent was to have the method and timing of payment resolved by the end of April 2024, however, as of the date of this filing these issues have not been resolved. Other. The Advance payments, long-term line item on the Condensed Consolidated Balance Sheets for the period ended March 28, 2024 includes $18.9 related to payments received from an Aftermarket segment customer for contracted work that was impacted by the sanctions imposed by the U.S. and other governments on Russia following its invasion of Ukraine.

Advances on the B787 Program. Boeing has made advance payments to Spirit under the B787 Special Business Provisions and General Terms Agreement (collectively, the “B787 Supply Agreement”) that are required to be repaid to Boeing by way of offset against the purchase price for future shipset deliveries. Advance repayments were initially scheduled to be spread evenly over the remainder of the first 1,000 B787 shipsets delivered to Boeing. On April 8, 2014, Spirit signed a memorandum of agreement with Boeing that suspended advance repayments related to the B787 program for a period of twelve months beginning April 1, 2014. Repayment recommenced on April 1, 2015, and any repayments that otherwise would have become due during such twelve-month period will offset the purchase price for shipsets 1001 through 1120. On December 21, 2018, Spirit signed a memorandum of agreement with Boeing that again suspended the advance repayments beginning with line unit 818. The advance repayments resumed in 2022 at a lower rate of $0.45 per shipset at line unit number 1135 and will continue through line number 1605.

In the event Boeing does not take delivery of a sufficient number of shipsets to repay the full amount of advances prior to the termination of the B787 program or the B787 Supply Agreement, any advances not then repaid will be applied against any outstanding payments then due by Boeing to us, and any remaining balance will be repaid in annual installments of $27.0 due on December 15th of each year until the advance payments have been fully recovered by Boeing. As of March 28, 2024, the amount of advance payments received from Boeing under the B787 Supply Agreement and not yet repaid was approximately $183.2.

In support of tooling and capital expenditures for future production rate increases on the B787 program, the memorandum of agreement entered into on October 12, 2023 between Boeing and Spirit (the “2023 MOA”) included an agreement for Boeing to advance Spirit a total of $71.7 in quarterly installments beginning October 2023 through April 2025. Spirit will align the repayment plan to coincide with deliveries to Boeing beginning April 2025 through October 2027. In the event Boeing does not take delivery of a sufficient number of shipsets to repay the full amount of advance prior to October 31, 2027, the remaining balance up to the $71.7 will be due in the fourth quarter of 2027. As of March 28, 2024, the amount of advance payments received by Spirit from Boeing and not yet repaid was approximately $32.2.

Advances on the A350 Program. During the twelve months ended December 31, 2023, the Company received an advance payment from Airbus of $100.0 under an agreement between Airbus S.A.S. and Spirit AeroSystems (Europe) Limited (“Spirit Europe”) signed on June 23, 2023 (the “A350 Agreement”). The A350 Agreement provides for up to $100.0 of advances that are required to be repaid along with a nominal fee to Airbus by way of offset against the purchase price of A350 FLE shipset deliveries in 2025. To the extent actual deliveries in 2025 are insufficient to offset the advance amount, any amount not offset against deliveries will be due and payable to Airbus on December 31, 2025. In connection with the A350 Agreement, Spirit Europe has pledged certain program assets including work in process inventories and raw materials at Spirit’s Scotland facility in an amount sufficient to cover the advances.

Advances on the A220 Program. During the three months ended March 28, 2024, the Company received an advance payment from Airbus of $17.0 under a term sheet agreement between Airbus Canada Limited Partnership (“Airbus Canada”) and Shorts Brothers PLC (the Company’s facilities located in Belfast, Northern Ireland), for short term funding for increased freight costs incurred in the period from January to March 2024. This advance will form part of a financial support package under a proposed Memorandum of Agreement under negotiations between the parties and shall be used by the Company to enable timely delivery of aerostructures via air freight through March 31, 2024. The increased freight costs will be fully borne by the Company. The parties’ original intent was to have the method and timing of payment resolved by the end of April 2024, however, as of the date of this filing these issues have not been resolved.

Other. The Advance payments, long-term line item on the Condensed Consolidated Balance Sheets for the period ended March 28, 2024 includes $18.9 related to payments received from an Aftermarket segment customer for contracted work that was impacted by the sanctions imposed by the U.S. and other governments on Russia following its invasion of Ukraine.