level for minimum consolidated shareholders equity and removing the mechanism for suspending the minimum interest coverage ratio if certain debt ratings are met.
Secured debt financing
As of March 31, 2021, the outstanding balance on our secured debt financings, including our secured warehouse facility and our export credit financing, was $246.7 million and we had pledged 10 aircraft as collateral with a net book value of $493.2 million. As of December 31, 2020, the outstanding balance on our secured debt financings, including our secured warehouse facility and our export credit financing, was $301.0 million and we had pledged 12 aircraft as collateral with a net book value of $628.7 million.
Preferred equity
On March 5, 2019, we issued 10,000,000 shares of 6.15% Fixed-to-Floating Non-Cumulative Perpetual Preferred Stock, Series A (the “Series A Preferred Stock”), $0.01 par value, with a liquidation preference of $25.00 per share. We will pay dividends on the Series A Preferred Stock only when, as and if declared by the board of directors. Dividends will accrue, on a non-cumulative basis, on the stated amount of $25.00 per share at a rate per annum equal to: (i) 6.15% during the first five years and payable quarterly in arrears beginning on June 15, 2019, and (ii) three-month LIBOR plus a spread of 3.650% per annum from March 15, 2024, reset quarterly and payable quarterly in arrears beginning on June 15, 2024.
We may redeem shares of the Series A Preferred Stock at our option, in whole or in part, from time to time, on or after March 15, 2024, for cash at a redemption price equal to $25.00 per share, plus any declared and unpaid dividends to, but excluding, the redemption date, without accumulation of any undeclared dividends. We may also redeem shares of the Series A Preferred Stock at our option under certain other limited conditions.
On March 2, 2021, we issued 300,000 shares of 4.65% Fixed-Rate Reset Non-Cumulative Perpetual Series B Preferred Stock, $0.01 par value, with a liquidation preference of $1,000 per share. We will pay dividends on the preferred stock only when, as and if declared by the board of directors. Dividends will accrue, on a non-cumulative basis, on the stated amount of $1,000 per share at a rate per annum equal to: (i) 4.65% through June 15, 2026, and payable quarterly in arrears beginning on June 15, 2021, and (ii) the Five-year U.S. Treasury Rate as of the applicable reset dividend determination date plus a spread of 4.076% per reset period from June 15, 2026 and reset every five years and payable quarterly in arrears.
We may redeem shares of the Series B Preferred Stock at its option, in whole or in part, from time to time, on or after June 15, 2026, for cash at a redemption price equal to $1,000 per share, plus any declared and unpaid dividends, without accumulation of any undeclared dividends. We may also redeem shares of the Series B Preferred Stock at our option under certain other limited conditions. The Series B Preferred Stock ranks on a parity with the Series A Preferred Stock.
On February 19, 2021, our board of directors approved a cash dividend of $0.384375 per share on our outstanding Series A Preferred Stock, which was paid on March 15, 2021 to holders of record of our Series A Preferred Stock as of February 28, 2021. On May 5, 2021, our board of directors approved a cash dividend of $0.384375 per share on our outstanding Series A Preferred Stock, which will be paid on June 15, 2021 to holders of record of our Series A Preferred Stock as of May 31, 2021. Additionally, on May 5, 2021, our board of directors approved a cash dividend of $13.304167 per share on our outstanding Series B Preferred Stock, which will be paid on June 15, 2021 to holders of record of our Series B Preferred Stock as of May 31, 2021.
Potential Impact of LIBOR Transition
As of March 31, 2021, we had approximately $1.1 billion of floating rate debt outstanding that used LIBOR as the applicable reference rate to calculate the interest on such debt. Additionally, our Series A Preferred Stock will in the future accrue dividends at a floating rate determined by reference to LIBOR, if available. The Chief Executive of the U.K. Financial Conduct Authority (the “FCA”), which regulates LIBOR, has announced that the FCA will no longer persuade or compel banks to submit rates for the calculation of LIBOR after 2021. However, for U.S dollar LIBOR, it appears that the relevant date may be deferred to June 30, 2023 for certain tenors (including overnight and one, three, six and 12 months), at which time the LIBOR administrator has indicated that it intends to cease publication of U.S. dollar