On March 13, 2019, the Federal Aviation Administration (FAA) issued an order to suspend operations of all 737 MAX aircraft in the U.S. and by U.S. aircraft operators following two fatal 737 MAX accidents. Non-U.S. civil aviation authorities have issued directives to the same effect. Deliveries of the 737 MAX have been suspended until clearance is granted by the appropriate regulatory authorities. In addition, multiple legal actions have been filed against us as a result of the accidents. We also are fully cooperating with U.S. government investigations related to the accidents and the 737 MAX program, including investigations by the U.S. Department of Justice and the Securities and Exchange Commission, the outcome of which may be material. We cannot reasonably estimate a range of loss, if any, not covered by available insurance that may result given the current status of the lawsuits, investigations and inquiries related to the 737 MAX.

We have developed software and pilot training updates for the 737 MAX and continue to work with the FAA and non-U.S. civil aviation authorities to complete remaining steps toward certification and readiness for return to service including addressing their questions on the software updates and how pilots will interact with the airplane controls and displays in different flight scenarios. As we complete rigorous software reviews and thorough testing procedures, we have identified and are now implementing additional updates to further improve overall system safety. We have assumed that computer and simulator training will be required and as a result, we have provisioned for certain training costs.

Prior to the grounding, the 737 production rate was 52 per month, and we had planned to increase the rate to 57 per month during 2019. Beginning in the second quarter of 2019, we reduced the production rate to 42 per month. We continued to produce at a rate of 42 per month through December 2019. We temporarily suspended 737 MAX production beginning in January 2020. During the first quarter of 2020, we completed airplanes that were already in process at the end of the fourth quarter of 2019 and have approximately 450 airplanes in inventory as of March 31, 2020.

In March 2020, we announced a temporary suspension of production operations in the Puget Sound area as a result of the COVID-19 crisis. Production operations resumed during the week of April 20, 2020 and the 737 team resumed working toward restarting production. We expect COVID-19 to reduce demand and have lowered production and delivery rate assumptions as described below.

We have assumed that we will resume 737 MAX aircraft production during the second quarter of 2020 as timing and conditions of return to service and COVID-19 impacts are better understood. We expect to gradually increase the production rate to 31 during 2021 and expect further gradual increases to correspond with market demand. We have assumed that the timing of regulatory approvals will enable 737 MAX deliveries to resume during the third quarter of 2020. We have also assumed that the majority of 737 MAX airplanes produced during the grounding and included within inventory will be delivered during the first year after the resumption of deliveries, although at a slower pace than our previous assumptions due to COVID-19. The slower production and delivery rate ramp-ups reflect commercial airline industry uncertainty due to the impact of COVID-19.

During 2019, the cumulative impacts of changes to assumptions regarding timing of return to service and timing of planned production rates and deliveries increased the estimated costs to produce and deliver the 3,100 undelivered aircraft then included in the accounting quantity by approximately $6.3 billion. These costs will result in lower 737 margins in future periods after deliveries resume. There were no significant changes to these estimates related to MAX regulatory approvals assumptions in 2020.

During the first quarter of 2020, we reduced the number of aircraft included in the accounting quantity by 400 units as a result of reductions to planned production rates due to COVID-19 driven market uncertainties. The COVID-19 related reductions to planned production rates will result in additional costs to produce and deliver undelivered aircraft and will further reduce margins after deliveries resume. In addition, abnormally low production rates will extend for a longer period once production resumes due to COVID-19 impacts and is expected to result in approximately $1 billion of additional abnormal production costs that will be expensed as incurred. During the first quarter of 2020, we expensed $797 of the approximately $5 billion of abnormal production costs we now expect to incur over approximately two years.

We are working with our customers to minimize the impact to their operations from grounded and undelivered aircraft. We continue to reassess the liability for estimated potential concessions and other considerations to customers on a quarterly basis. This reassessment includes updating estimates to reflect revisions to return to service, delivery and production rate assumptions driven by timing of regulatory approvals, as well as latest information based on engagements with 737 MAX customers. The liability represents our current best estimate of future concessions and other considerations to customers, and is necessarily based on a series of assumptions.

The FAA and other non-U.S. civil aviation authorities will determine the timing and conditions of return to service. Our assumptions reflect our current best estimate, but actual timing and conditions of return to service and resumption of deliveries could differ from this estimate, the effect of which could be material. We are unable at this time to reasonably estimate potential future additional financial impacts or a range of loss, if any, due to continued uncertainties related to the timing and conditions of return to service, uncertainties related to the impacts of COVID-19 on our operations, supply chain and customers, future changes to the production rate, supply chain impacts, and/or the results of negotiations with particular customers. Any such impacts, including any changes in our estimates, could have a material adverse effect on our financial position, results of operations, and/or cash flows. For example, we expect that, in the event that we are unable to resume aircraft deliveries consistent with our assumptions, the continued absence of revenue,

earnings, and cash flows associated with 737 MAX deliveries would continue to have a material impact on our operating results. In the event that future production rate increases occur at a slower rate or take longer than we are currently assuming, we expect that the growth in inventory and other cash flow impacts associated with production would decrease. However, while any prolonged production suspension or delays in planned production rate increases could mitigate the impact on our liquidity, it could significantly increase the overall expected costs to produce aircraft included in the accounting quantity, which would reduce 737 program margins and/or increase abnormal production costs in the future.

The liabilities recorded represent our best estimate or the low end of a range of reasonably possible costs expected to be incurred to remediate sites, including operation and maintenance over periods of up to 30 years. It is reasonably possible that we may incur charges that exceed these recorded amounts because of regulatory agency orders and directives, changes in laws and/or regulations, higher than expected costs and/or the discovery of new or additional contamination. As part of our estimating process, we develop a range of reasonably possible alternate scenarios that includes the high end of a range of reasonably possible cost estimates for all remediation sites for which we have sufficient information based on our experience and existing laws and regulations. There are some potential remediation obligations where the costs of remediation cannot be reasonably estimated. At March 31, 2020 and December 31, 2019, the high end of the estimated range of reasonably possible remediation costs exceeded our recorded liabilities by $1,077.

The increase in the product warranty reserve during the three months ended March 31, 2020 is primarily driven by charges related to “pickle forks”. During 2019, we detected cracks in the "pickle forks", a frame fitting component of the structure connecting the wings to the fuselages of 737NG aircraft. We notified the FAA, which issued a directive requiring that certain 737NG airplanes be inspected. We have estimated the number of aircraft that will have to be repaired in the future and provisioned for the estimated costs of completing the repairs. We recognized charges of $135 in 2019 for current and projected future aircraft repairs. During the first quarter of 2020, we recognized additional charges of $336 based on revised engineering and fleet utilization estimates as well as updated repair cost estimates. We cannot estimate a range of reasonably possible losses, if any, in excess of amounts recognized due to the ongoing nature of the inspections and repairs and pending the completion of investigations into the cause of the condition.

In conjunction with signing definitive agreements for the sale of new aircraft (Sale Aircraft), we have entered into trade-in commitments with certain customers that give them the right to trade in used aircraft at a specified price upon the purchase of Sale Aircraft. The probability that trade-in commitments will be exercised is determined by using both quantitative information from valuation sources and qualitative information from other sources. The probability of exercise is assessed quarterly, or as events trigger a change, and takes into consideration the current economic and airline industry environments. Trade-in commitments, which can be terminated by mutual consent with the customer, may be exercised only during the period specified in the agreement, and require advance notice by the customer.

Trade-in commitment agreements at March 31, 2020 have expiration dates from 2020 through 2026. At March 31, 2020 and December 31, 2019 total contractual trade-in commitments were $1,230 and $1,407. As of March 31, 2020 and December 31, 2019, we estimated that it was probable we would be obligated to perform on certain of these commitments with net amounts payable to customers totaling $673 and $711 and the fair value of the related trade-in aircraft was $639 and $678.

Financing commitments related to aircraft on order, including options and those proposed in sales campaigns, and refinancing of delivered aircraft, totaled $13,176 and $13,377 as of March 31, 2020 and December 31, 2019. The estimated earliest potential funding dates for these commitments as of March 31, 2020 are as follows:

As of March 31, 2020, all of these financing commitments relate to customers we believe have less than investment-grade credit. We have concluded that no reserve for future potential losses is required for these financing commitments based upon the terms, such as collateralization and interest rates, under which funding would be provided.

We have entered into standby letters of credit and surety bonds with financial institutions primarily relating to the guarantee of our future performance on certain contracts. Contingent liabilities on outstanding letters of credit agreements and surety bonds aggregated approximately $4,092 and $3,769 as of March 31, 2020 and December 31, 2019.

The Bipartisan Budget Act of 2019 raised the Budget Control Act limits on federal discretionary defense and non-defense spending for fiscal years 2020 and 2021 (FY20 and FY21), reducing budget uncertainty and the risk of sequestration. The consolidated appropriations acts for FY20, enacted in December 2019, provided FY20 appropriations for government departments and agencies, including the United States Department of

Defense (U.S. DoD), the National Aeronautics and Space Administration (NASA) and the FAA. In February 2020, the U.S. administration submitted its request for $740.5 billion in base national defense spending for FY21, congruent with the amended spending limit.

The enacted FY20 appropriations included funding for Boeing’s major programs, such as the F/A-18 Super Hornet, F-15EX, CH-47 Chinook, AH-64 Apache, V-22 Osprey, KC-46A Tanker, P-8 Poseidon and Space Launch System. However, there continues to be uncertainty with respect to future program-level appropriations for the U.S. DoD and other government agencies, including NASA. Future budget cuts or investment priority changes, including changes associated with the authorizations and appropriations process, could result in reductions, cancellations and/or delays of existing contracts or programs. Any of these impacts could have a material effect on our results of operations, financial position and/or cash flows.

Fixed-price development work is inherently uncertain and subject to significant variability in estimates of the cost and time required to complete the work. BDS fixed-price contracts with significant development work include Commercial Crew, KC-46A Tanker, T-7A Red Hawk, VC-25B, MQ-25, and commercial and military satellites. The operational and technical complexities of these contracts create financial risk, which could trigger termination provisions, order cancellations or other financially significant exposure. Changes to cost and revenue estimates could result in lower margins or material charges for reach-forward losses. For example, we have recorded a reach-forward loss of $827 on KC-46A Tanker in the first quarter of 2020. The KC-46A Tanker reach-forward loss reflects $551 of costs associated with the agreement signed in April 2020 with the U.S. Air Force to develop and integrate a new Remote Vision System, and the remaining costs reflect productivity inefficiencies and COVID-19 related factory disruption. Moreover, our fixed-price development programs remain subject to additional reach-forward losses if we experience further production, technical or quality issues, schedule delays, or increased costs.

In 2011, we were awarded a contract from the U.S. Air Force (USAF) to design, develop, manufacture and deliver four next generation aerial refueling tankers. This Engineering, Manufacturing and Development (EMD) contract is a fixed-price incentive fee contract and involves highly complex designs and systems integration. Since 2016, the USAF has authorized five low rate initial production (LRIP) lots for a total of 67 aircraft. The EMD contract and authorized LRIP lots are valued at approximately $15 billion.

Our final incurred costs for each year are subject to audit and review for allowability by the U.S. government, which can result in payment demands related to costs they believe should be disallowed. We work with the U.S. government to assess the merits of claims and where appropriate reserve for amounts disputed. If we are unable to satisfactorily resolve disputed costs, we could be required to record an earnings charge and/or provide refunds to the U.S. government.