The components of long-term debt (net of discounts and debt issuance costs), along with maturity dates for the years subsequent to May 31, 2021, are as follows (in millions):

				May 31,
				2021		2020
	Interest Rate%		Maturity
Senior secured debt:		1.875	2034	$	932	$	—
Senior unsecured debt:		3.40	2022		—		498
	2.625-2.70		2023		—		748
		4.00	2024		—		747
	3.20-3.80		2025		—		1,687
		3.25	2026		746		745
		3.30	2027		—		446
		3.40	2028		496		496
		4.20	2029		397		397
	3.10-4.25		2030		1,733		1,732
		2.40	2031		989		—
		4.90	2034		496		495
		3.90	2035		494		494
		3.25	2041		739		—
	3.875-4.10		2043		985		984
		5.10	2044		742		742
		4.10	2045		641		641
	4.55-4.75		2046		2,461		2,461
		4.40	2047		736		735
		4.05	2048		986		986
		4.95	2049		836		835
		5.25	2050		1,226		1,225
		4.50	2065		246		246
		7.60	2098		237		237
Euro senior unsecured debt:		0.70	2022		—		695
		1.00	2023		—		815
		0.45	2026		607		541
		1.625	2027		1,516		1,351
		0.45	2029		725		—
		1.30	2032		604		539
		0.95	2033		784		—
Total senior unsecured debt					19,422		21,518
Finance lease obligations					525		485
					20,879		22,003
Less current portion					146		51
				$	20,733	$	21,952

Interest on our U.S. dollar fixed-rate notes is paid semi-annually. Interest on our euro fixed-rate notes is paid annually. The weighted average interest rate on long-term debt was 3.4% as of May 31, 2021. Long-term debt, including current maturities and exclusive of finance leases, had estimated fair values of $23.1 billion at May 31, 2021 and $22.8 billion at May 31, 2020. The estimated fair values were determined based on quoted market prices and the current rates offered for debt with similar terms and maturities. The fair value of our long-term debt is classified as Level 2 within the fair value hierarchy. This classification is defined as a fair value determined using market-based inputs other than quoted prices that are observable for the liability, either directly or indirectly.

We have a shelf registration statement filed with the Securities and Exchange Commission (“SEC”) that allows us to sell, in one or more future offerings, any combination of our unsecured debt securities and common stock and allows pass-through trusts formed by FedEx Express to sell, in one or more future offerings, pass-through certificates.

During August 2020, FedEx Express issued $970 million of Pass-Through Certificates, Series 2020-1AA (the “Certificates”) with a fixed interest rate of 1.875% due in February 2034 utilizing pass-through trusts (the “Trusts”). The Certificates are secured by 19 Boeing aircraft with a net book value of $1.9 billion at May 31, 2021. The payment obligations of FedEx Express in respect of the Certificates are fully and unconditionally guaranteed by FedEx. FedEx Express is using the proceeds from the issuance for general corporate purposes.

Each Trust meets the definition of a variable interest entity, or VIE, as defined in the Consolidations topic of the Codification (ASC 810), and must be considered for consolidation in our financial statements. Our assessment of the Trusts considers both quantitative and qualitative factors, including the purpose for which the Trust was established and the nature of the risks related to the Trusts. Neither FedEx nor FedEx Express invests in or possesses a financial interest in the Trusts. Rather, FedEx Express has an obligation to make interest and principal payments, which are fully and unconditionally guaranteed by FedEx, and is not the primary beneficiary of the Trusts. Based on this analysis, we determined that we are not required to consolidate the Trusts.

On March 16, 2021, we entered into an amended and restated $2.0 billion Five-Year Credit Agreement and a $1.5 billion 364-Day Credit Agreement. The Five-Year Credit Agreement expires in March 2026 and includes a $250 million letter of credit sublimit. The 364-Day Credit Agreement expires in March 2022. The Credit Agreements are available to finance our operations and other cash flow needs. As of May 31, 2021, no commercial paper was outstanding, and we had $250 million of the letter of credit sublimit unused under the Five-Year Credit Agreement. Outstanding commercial paper reduces the amount available to borrow under the Credit Agreements.

Prior to the amendment of the Five-Year Credit Agreement and entry into the current 364-Day Credit Agreement on March 16, 2021, our credit agreements contained a financial covenant requiring us to maintain a ratio of debt to consolidated earnings (excluding noncash retirement plans MTM adjustments, noncash pension service costs and noncash asset impairment charges) before interest, taxes, depreciation and amortization (“adjusted EBITDA”) of not more than 3.75 to 1.0, calculated as of May 31, 2021 on a rolling four-quarters basis. Effective March 16, 2021, we are required to maintain a ratio of debt to adjusted EBITDA of not more than 3.5 to 1.0, calculated as of the end of the applicable quarter on a rolling four-quarter basis. The ratio of our debt to adjusted EBITDA was 1.97 to 1.0 at May 31, 2021.

We believe the financial covenant discussed above is the only significant restrictive covenant in the Credit Agreements. The Credit Agreements contain other customary covenants that do not, individually or in the aggregate, materially restrict the conduct of our business. We are in compliance with the financial covenant and all other covenants in the Credit Agreements and do not expect the covenants to affect our operations, including our liquidity or expected funding needs. If we failed to comply with the financial covenant or any other covenants in the Credit Agreements, our access to financing could become limited.

During the fourth quarter of 2021, we issued $3.25 billion of senior unsecured debt under our current shelf registration statement, comprised of €600 million of 0.45% fixed-rate notes due in May 2029 (the “Sustainability Notes”), €650 million of 0.95% fixed-rate notes due in May 2033, $1.0 billion of 2.40% fixed-rate notes due in May 2031 and $750 million of 3.25% fixed-rate notes due in May 2041. We used the net proceeds from these offerings to redeem the $500 million aggregate principal amount outstanding of our 3.40% notes due 2022, the €640 million aggregate principal amount outstanding of our 0.70% notes due 2022, the $500 million aggregate principal amount outstanding of our 2.625% notes due 2023, the €750 million aggregate principal amount outstanding of our 1.00% notes due 2023, the $250 million aggregate principal amount outstanding of our 2.70% notes due 2023, the $750 million aggregate principal amount outstanding of our 4.00% notes due 2024, the $700 million aggregate principal amount outstanding of our 3.20% notes due 2025, the $1.0 billion aggregate principal amount outstanding of our 3.80% notes due 2025 and the $450 million aggregate principal amount outstanding of our 3.30% notes due 2027. We intend to use an amount equal to the net proceeds from the offering of the Sustainability Notes to fund or refinance a portfolio of new or ongoing projects in the following areas: clean transportation; green buildings; energy efficiency; eco-efficient and/or circular economy adapted products, production technologies and processes; pollution prevention and control; renewable energy; and socioeconomic advancement and empowerment. As a result of the debt redemption, we recognized a loss on debt extinguishment of $393 million in 2021.