Exhibit 99.39 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-L KEY PERFORMANCE FACTORS April 30, 2001 Expected B Maturity 10/16/06 Blended Coupon 5.3558% Excess Protection Level 3 Month Average 7.59% April, 2001 7.46% March, 2001 7.97% February, 2001 7.35% Cash Yield19.61% Investor Charge Offs 4.98% Base Rate 7.18% 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$750,000,000.00 Seller Participation Amount$5,425,622,873.29