Exhibit 99.51 MBNA MASTER CREDIT CARD TRUST II SERIES 2000-L KEY PERFORMANCE FACTORS April 30, 2001 Expected B Maturity 11/15/2007 Blended Coupon 6.3903% Excess Protection Level 3 Month Average 7.68% April, 2001 7.52% March, 2001 8.09% February, 2001 7.43% Cash Yield19.61% Investor Charge Offs 4.98% Base Rate 7.12% Over 30 Day Delinquency 4.89% Seller's Interest 9.33% Total Payment Rate13.70% Total Principal Balance$58,171,313,434.78 Investor Participation Amount$500,000,000.00 Seller Participation Amount$5,425,622,873.29